Relevant bibliographies by topics / Lasure

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Lasure'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Lasure"

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Ternovenko, P. V. "DESCRIPTION AND ANALYSIS OF LASURE DISPOSAL." EurasianUnionScientists 1, no. 62 (2019): 4–7. http://dx.doi.org/10.31618/esu.2413-9335.2019.1.62.85.

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Jaffe, Susan. "Chiquita Brooks-LaSure: innovative US federal health director." Lancet 398, no. 10300 (August 2021): 571. http://dx.doi.org/10.1016/s0140-6736(21)01796-7.

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Raper, Carlene A. "More Gene Manipulations in Fungi.J. W. Bennett , Linda L. Lasure." Quarterly Review of Biology 68, no. 1 (March 1993): 103–4. http://dx.doi.org/10.1086/417944.

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Bond, Jeff. "More Gene Manipulations in Fungi. Edited by J. W. Bennett and L. L. Lasure. Academic Press. 1991. 470 pages. £45.50. $75.00. ISBN 0 12 088642 1." Genetical Research 60, no. 3 (December 1992): 236–37. http://dx.doi.org/10.1017/s0016672300030998.

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Bond, Jeff. "Gene Manipulation in Fungi. Edited by J. W. Bennett and Linda L. Lasure. Orlando: Academic Press. 558 Pages. Cloth £65, Paper £35. ISBN 0 12 088640 5." Genetical Research 47, no. 3 (June 1986): 232–33. http://dx.doi.org/10.1017/s0016672300023193.

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Leuchtenberger, A. "Gene Manipulations in Fungi. Herausgegeben von J. W. Benneit und L. L. Lasure. 558 Seiten, zahlr. Abb. und Tab. Academic Press, Inc. Orlando, San Diego, New York, Austin, London, Montreal, Sydney, Tokyo, Toronto 1985. Preis: 75,00 $; 65,00 £ (in paperback 39,95 $; 35,00 £)." Food / Nahrung 30, no. 10 (1986): 1065. http://dx.doi.org/10.1002/food.19860301053.

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Barth, G. "J. W. Bennett and L. L. L. Lasure (Editors), Gene Manipulations in Fungi. XIX + 558 S., 51 Abb., 52 Tab. Orlando-San Diego-New York-Austin-London-Montreal-Sydney-Tokyo-Toronto 1985. Academic Press. $ 75.00. ISBN: 0-12-088640-5." Journal of Basic Microbiology 27, no. 8 (1987): 426. http://dx.doi.org/10.1002/jobm.3620270805.

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Yi Zheng, Yi Zheng, Jinglong Ma Jinglong Ma, Xulei Ge Xulei Ge, Yutong Li Yutong Li, Zhiyi Wei Zhiyi Wei, and Jie Zhang Jie Zhang. "A multipass Ti:sapphire laser amplifier pumped with homogenized Nd:YAG lasers." Chinese Optics Letters 12, s2 (2014): S21412–321415. http://dx.doi.org/10.3788/col201412.s21412.

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Onachenko, M. S. "Superluminescent laser-integrated nanocarbonized matrix pumping the neodymium lasers YAG:Nd." Semiconductor Physics Quantum Electronics and Optoelectronics 18, no. 3 (September 30, 2015): 367–71. http://dx.doi.org/10.15407/spqeo18.03.367.

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Song Yue, 宋越, 王志敏 Wang Zhimin, 张丰丰 Zhang Fengfeng, 薄勇 Bo Yong, and 彭钦军 Peng Qinjun. "638 nm、532 nm 激光泵浦的连续波翠绿宝石激光器." Infrared and Laser Engineering 50, no. 3 (2021): 20200217. http://dx.doi.org/10.3788/irla20200217.

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Dissertations / Theses on the topic "Lasure"

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Martinez, Thomas. "Revêtements photocatalytiques pour matériaux de construction : formulation, évaluation de l'efficacité et écotoxicité." Toulouse 3, 2012. http://thesesups.ups-tlse.fr/2024/.

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La photocatalyse est un procédé qui présente un fort potentiel dans le traitement de la pollution organique, qu'elle soit en phase gazeuse, en phase aqueuse ou biologique. Généralement, des particules ultrafines de TiO2 sont employées pour leurs performances photocatalytiques élevées mais également pour leurs propriétés de super-hydrophilie sous irradiation UV à l'origine de propriétés autonettoyantes. L'objectif de ce travail est de conférer aux matériaux de constructions des propriétés photocatalytiques qui permettent de lutter contre la pollution atmosphérique et contre le développement des algues sur les parements en béton. Dans ce but le photocatalyseur a été mis en œuvre dans un revêtement de type lasure. Ce type de produit a été choisi pour son intérêt architectural : il permet le traitement des surfaces existantes tout en conservant leur aspect initial. En outre, il permet d'optimiser les quantités de photocatalyseur utilisées, le phénomène de photocatalyse étant un phénomène de surface. Le travail de formulation de la lasure a été effectué en utilisant des constituants exempts de solvants organiques afin de limiter la toxicité du produit final. La stabilité et l'homogénéité de la lasure ont été vérifiées dans son état de stockage. L'adhésion du revêtement obtenu a été évaluée par des essais d'abrasion. L'efficacité de la lasure a été étudiée vis-à-vis de plusieurs polluants représentatifs de la pollution atmosphérique : les oxydes d'azote (NOx) et un mélange de COV (BTEX : benzène, toluène, ethylbenzène, xylènes). Les propriétés d'inhibition des croissances biologiques ont été évaluées sur l'algue Chlorella, une espèce d'algues souvent rencontrée dans la composition microbiologique des salissures des façades. Dans le but d'étudier l'innocuité de la formulation, les émissions de COV de la lasure ainsi que l'impact toxique et génotoxique d'un re-largage dans le milieu aquatique ont été évalués. Un banc de mesure a été conçu et mis en œuvre afin d'étudier l'influence du matériau photocatalytique (formulation et support d'application) et des conditions opératoires (humidité, concentration initiale en polluant, temps de contact entre le gaz et la surface photocatalytique) sur l'oxydation photocatalytique des COV et des NOx. Les résultats ont montré que les performances dépendaient du taux d'humidité de l'air et de la concentration initiale en polluants mais également de la nature du substrat utilisé pour l'application du revêtement. Par ailleurs, les essais de durabilité de la lasure appliquée sur support mortier ont montré que les performances d'abattement des NOx n'étaient pas impactées par l'application de cycles d'abrasion. Les essais de croissance biologique ont été menés à l'aide de deux dispositifs permettant de simuler deux conditions environnementales différentes : un écoulement de l'eau sur les surfaces inclinées et une humidification par remontées capillaires de l'eau dans le matériau. Quelque soient les conditions expérimentales, aucun ralentissement du développement des salissures biologiques n'a pu être attribué au phénomène de photocatalyse. Ces observations corroborent certains résultats bibliographiques montrant que le développement biologique n'est pas influencé par la présence d'un photocatalyseur, alors que les propriétés dépolluantes du matériau ont été validées sur d'autres composés. Toutefois, dans nos essais, un net ralentissement des développements biologiques a pu être observé en utilisant un hydrofuge de surface, un autre type de surface auto-nettoyante. L'évaluation de l'innocuité du produit par les mesures des émissions de COV dans l'air ont montré que des composés caractéristiques de la composition de la lasure peuvent être détectés quelque soient les conditions d'éclairement. Par ailleurs, l'étude d'écotoxicité a permis d'identifier une concentration de la lasure au-delà de laquelle une inhibition de croissance chez les larves de xénope peut être mesurée. Cependant, ces travaux n'ont pas permis de mettre en évidence une génotoxicité chez les organismes testés
Photocatalysis shows great potential in the treatment of organic pollution, in gaseous or aqueous phases. Generally, ultrafine TiO2 particles are used for their photocatalytic performance but also for their superhydrophilicity under UV irradiation. These properties are responsible for the depolluting and self-cleaning functions of the resulting product. The aim of this PhD work is to use building materials as air purifiers and to limit levels of biofouling. For this purpose, the photocatalyst is implemented in a glaze. This type of product was chosen for its architectural interest: it allows existing surfaces to be treated while preserving their original appearance. In addition, because photocatalysis is a surface phenomenon, solutions such as coatings are particularly interesting since they can be applied to existing buildings and, at the same time, result in lower TiO2 consumption The coating was formulated using components free of organic solvents to reduce the toxicity of the final product. The stability and homogeneity of the glaze were verified in its storage conditions and the adhesion of the coating obtained was evaluated by abrasion tests. The photocatalytic properties were studied against several pollutants representative of air pollution: nitrogen oxides (NOx) and a mixture of VOCs (BTEX: benzene, toluene, ethylbenzene, xylenes). Biological growth was assessed on the algae Chlorella (algal species often found in the microbiological composition of soil facades). In order to investigate the possible toxicity of the formulation, the VOC emissions from the glaze and the toxic and genotoxic impact of release into the aquatic environment were assessed. An experimental set-up was developed in order to study the influence of photocatalytic material (formulation and substrate) and operating conditions (humidity, pollutant initial concentration, contact time between the gas and the photocatalytic surface) on the photocatalytic oxidation of VOCs and NOx. The results showed that the performance depended on the humidity of the air, the initial concentration of pollutants and also the nature of the substrate coated. In addition, the durability evaluation of the glaze applied to mortar surfaces showed that the performance of NOx abatement was slightly impacted by the application of abrasion cycles (ISO 11998 and ASTM D2486). Biological growth assays were conducted using two devices to simulate different environmental conditions: a flow of water on inclined surfaces and humidification by capillarity. Whatever the experimental conditions, no inhibition of biofouling could be attributed to the phenomenon of photocatalysis. These observations support some literature results showing that biological development is not influenced by the presence of a photocatalyst, while the depolluting properties of the material have been validated on other compounds. However, in our tests, a slowdown in biological development could be observed using a water-repellent surface, another type of self-cleaning surface. The product toxicity assessment by measurement of VOCs in air showed that compounds characteristic of the composition of the glaze could be detected whatever the lighting conditions. In addition, the ecotoxicity assessment identified a concentration of the glaze beyond which growth inhibition in Xenopus larvae could be measured. However, these studies did not demonstrate genotoxicity in the organisms tested
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Wadsworth, W. J. "Copper vapour laser pumped TI:sapphire lasers." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389029.

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Maker, Gareth Thomas. "Diode laser pumped solid state lasers." Thesis, University of Southampton, 1990. https://eprints.soton.ac.uk/397281/.

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This thesis deals with the development of diode laser pumped solid state lasers. The earliest work presented enabled 125W peak power, single frequency Q-switched pulses to be obtained from a 100mW diode laser pumped Nd:YAG laser. Using a 500mW diode laser as a pump source for C.W. Nd:YAG and Nd:YLF oscillators an Yb:Er fibre laser was pumped, producing 0.75mW C.W. power at a wavelength of 1.56µm. Acousto-optic mode-locking techniques were used to provide C.W. mode-locked pulse durations in Nd:YAG and Nd:YLF of 55ps and 18ps respectively, at repetition rates of 240MHz. Frequency modulation mode-locking was shown to be a superior technique, giving pulse durations of 11.5ps and 10ps in diode laser pumped Nd:YAG and Nd:YLF oscillators respectively. FM operation of diode laser pumped Nd:YAG lasers was investigated, yielding a maximum FM bandwidth of 70GHz. Spatial hole burning was considered to be an important factor in this result. Using a 1W diode laser to pump a mode-locked and Q-switched Nd:YLF oscillator peak power levels of 70kW were obtained at a wavelength of 1.047µm. Frequency doubling this output in MgO:LiNbO3 with an energy conversion efficiency of 47% enabled other tunable lasers to be pumped using the second harmonic. Firstly, a synchronously pumped rhodamine 6G dye laser is described which is capable of producing 3.2ps mode-locked pulses in a Q-switched envelope with peak powers of around 10kW. Secondly, a synchronously pumped doubly resonant optical parametric oscillator tunable between 983nm and 1119nm is described. Lastly, a Ti:Sapphire laser producing 400ns pulses with peak powers of 3W at a wavelength of 755nm is demonstrated. This oscillator could be wavelength tuned between 746nm and 838nm. A highly efficient method of frequency doubling C.W. mode-locked lasers was developed. Using an external resonant cavity a frequency doubling energy conversion efficiency of 61% to 532nm was achieved, giving 87mW average power in 8.5ps pulses.
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Kapitan, Daniel. "Laser ablation with copper vapour lasers." Thesis, University of Oxford, 1999. https://ora.ox.ac.uk/objects/uuid:a1dc1a3b-602a-4ebb-abe2-734e8e11f15a.

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The use of copper vapour lasers for laser ablation in laser materials processing applications is studied. To this purpose, the generation of near diffraction-limited beam quality output from a single medium-scale oscillator is demonstrated via matching the total buffer gas pressure to the specific electrical input power loading and the degree of insulation of the plasma tube. The design and characterisation of a Master-Oscillator Power-Amplifier system based on a smallbore oscillator is also described, focusing on pulse stretching techniques to provide efficient seeding required for producing 20-50 W high beam-quality output for laser materials processing purposes. Various experimental studies on the fundamental processes of laser ablation of metals are presented. The effect of the background gas properties on shock-wave formation in laser generated plasmas is studied using a ballistic pendulum. The experimental findings are found to be accurately described by a modified Sedov-Taylor-Von Neumann theory which accounts for the effect of the piston-mass. The theory is applied to characterise the fluorination process in the shock-wave, in view of oxygen isotope analysis in geochemistry. Atomic emission spectroscopy is shown to provide some measure of the electron temperature and electron density at the plasma core. The experimental results are discussed in view of existing models to describe the extreme Stark-broadening and self-absorption in dense, cool plasmas. A comparative study of the use of femtosecond and nanosecond pulsed lasers for laser ablation of metals is presented to assess the relative importance of thermal diffusion. Measurement of the recoil momentum due to ejection of molten particulates during ablation in vacuum provides insight into the effect of material properties. Diffusion-limited surface texturing of metals via direct transfer of an optical interference patterns is demonstrated.
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Segeťa, Petr. "Studium vlastností vrstvy uhlíkaté oceli navařené vysokovýkonným polovodičovým laserem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231513.

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The aim of my thesis is the analysis of properties of laser cladding. The theoretical part is focus on conventional methods of laser cladding, types and properties of lasers and its applications in industry. Then there is the description of preparing metallographic samples and its assessment, also there are types of wear enclosed. In the experimental part the nickel laser cladding were made by using semiconductor laser, in which the structure, the dilution, the EDS analysis and the hardness with respect to input parameters are assessed.
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SANTOS, ROBERTO de B. "Microfuracao com laser pulsado." reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10900.

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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Hempler, Nils. "Semiconductor disk laser pumped Cr²⁺:chalcogenide lasers." Thesis, University of Strathclyde, 2010. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=15339.

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Friart, Gaetan. "Semiconductor laser dynamics: two polarization feedback, quantum cascade lasers, and ring lasers." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/248835.

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Semiconductor lasers (Sls) are very sensitive to external perturbations which may destabilize their steady output. This is particularly striking when the SL is subject to optical feedback, i.e. when part of the light coming out of the laser is reinjected in the cavity after reflection from a distant mirror. For some applications, this is a nuisance that we wish to avoid. But optical feedback may also drive the laser into dynamical regimes which are useful for new applications. In this thesis, we study different problems where an SL is subject to a delayed feedback or to an injected signal. These problems are motivated by recent experiments, technological issues, or particular dynamical phenomena. Specifically, we combine analytical techniques, numerical simulations, and experiments to investigate the bifurcation mechanisms leading to a large variety of oscillatory outputs. The systems that we discuss are an edge-emitting laser with polarization-rotated optical feedback, a two-mode laser with optical injection, a quantum cascade laser with optical feedback, and a semiconductor ring laser with optical feedback. We show that the bifurcations from the steady-states are of primary importance. They not only delimit the stability boundaries of the laser output but they also form the backbone structure of many pulsating waveforms. We investigate these bifurcations in detail in order to find the best operating conditions to observe specific dynamical regimes. Our results highlight laser key parameters that allow their efficient control.
Les lasers à semi-conducteur sont sensibles aux perturbations externes et celles-ci peuvent déstabiliser leur faisceau de sortie d’intensité constante. Ceci est particulièrement marquant quand le laser à semi-conducteur est sujet à un feedback optique, c’est-à-dire quand une partie de la lumière sortant du laser est réinjectée dans sa cavité après réflexion par un miroir distant. Pour certaines applications, cela représente une nuisance que l’on souhaite éviter. Mais le feedback optique peut aussi engendrer des régimes dynamiques utiles pour de nouvelles applications. Dans cette thèse, nous étudions différents problèmes où un laser à semi-conducteur est soumis à un feedback retardé ou à un signal injecté. Nos travaux sont motivés par de récentes expériences, des questions technologiques ou des phénomènes dynamiques particuliers. Nous combinons des techniques analytiques, des simulations numériques ainsi que des expériences afin d’analyser les mécanismes de bifurcation menant à une large variété de régimes oscillants.Nous étudions en premier lieu la dynamique d’un laser à semi-conducteur soumis à un feedback avec rotation de la polarisation. Nous examinons, à la fois théoriquement et expérimentalement, la séquence de bifurcations menant à des oscillations sous forme d’ondes carrées. Nous mettons en évidence une multistabilité entre différentes ondes carrées de périodes spécifiques. Nous introduisons alors un mécanisme de contrôle qui nous permet de sélectionner l’onde carrée désirée. Nous analysons ensuite les frontières de stabilité d’un laser à semi-conducteur à deux polarisations soumis à une injection optique. Nous montrons que si les gains des deux modes de polarisation sont suffisamment proches, un état stationnaire mixte stable peut exister. Nous explorons également les conditions permettant une bistabilité entre un état stationnaire pur et un état stationnaire mixte. Les lasers à cascade quantique sont de nouveaux lasers à semi-conducteur prometteurs qui possèdent une forte tolérance au feedback optique. Nous examinons de façon systématique leur stabilité dans la limite des grands retards. Nous montrons que des instabilités oscillantes sont cependant possibles pour de faibles valeurs du courant de pompe. Le dernier dispositif que nous étudions dans cette thèse est le laser à semi-conducteur en anneau soumis à un feedback optique. Nous identifions le mécanisme de bifurcation, appelé pont de bifurcation, responsable des instabilités oscillantes dans le faisceau de sortie du laser. Ces oscillations sont indésirables pour la plupart des applications impliquant de tels lasers. Nous montrons qu’elles peuvent être évitées en contrôlant la phase du feedback.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
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Serres, Serres Josep Maria. "Continuous-wave and passively Q-switched solid-state microchip lasers in the near-infrared." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/460758.

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Aquest treball tracta de la caracterització de làsers compactes d'estat sòlid, amb un primer enfocament, l'estudi del concepte microxip aplicat al làser en diversos hostes cristal·lins dopats amb terres rares. Es reporta els resultats sobre l'estudi de l'efecte de thermal lens, necessari per a l'obtenció de làser amb aquesta configuració, així com pel funcionament làser amb continu i polsat utilitzant la tècnica Q-switch. En els experiments, el concepte microxip es defineix com una cavitat làser quasi monolítica. Aquest concepte s'estudia per a diferents emissions de làser a ~1.06 m d'ions Yb3+ i Nd3+, a ~1,3 m de Nd3+, a ~1,95 m de Tm3+ hi ha ~2.05 m del Ho3+. En el règim d'ona contínua s'examina detalladament per als ions de lantànids trivalents esmentats en diversos hostes cristal·lins amb l'objectiu de comparar el potencial de cada material. En aquest treball, es demostren eficiències molt properes al límit teòric. D'altra banda, també es presenten làsers polsats d'estat sòlid amb la configuració microxip amb diversos absorbidors saturables. Amb aquest propòsit, s'utilitzen com a absorbidors saturables nous nanomaterials com el MoS2, nanoestructures de carboni (SWCNT, el grafè d'una i de diverses capes) i un SESA. A més, el més convencional Cr:YAG (~1.06 m) i el Cr:ZnS (~1.9 m) s'examinen per comparar els seus rendiments.
Este trabajo trata de la caracterización de láseres compactos de estado sólido, con primer enfoque, el estudio del concepto microchip aplicado al láser en varios huéspedes cristalinos dopados con tierras raras. Se reporta los resultados sobre el estudio del efecto de la thermal lens, necesario para la obtención de láser con esta configuración, así como para el funcionamiento láser en continuo y pulsado utilizando la técnica Q-switch. En los experimentos, el concepto microchip se define como una cavidad láser casi monolítica. Este concepto se estudia para diferentes emisiones de láser a ~1.06 m de los iones Yb3+ y Nd3+, a ~1,3 m de Nd3+, a ~1,95 m de Tm3+ hay ~2.05 m del ion Ho3+. En régimen de onda continua se examina detalladamente para los iones de lantánidos trivalentes mencionados en varios huéspedes cristalinos con el objetivo de comparar el potencial de cada material. En este trabajo, se demuestran eficiencias muy cercanas al límite teórico. Por otra parte, también se presentan láseres pulsados de estado sólido con la configuración microchip con varios absorbedores saturables. Con este propósito, se utilizan como absorbedores saturables nuevos nanomateriales como el MoS2, nano-estructuras de carbono (SWCNT, el grafeno de una y de varias capas) y un SESA. Además, el más convencional Cr:YAG (~1.06 m) y el Cr:ZnS (~1.9 m) se examinan para comparar sus rendimientos
This work deals with the characterization of compact solid state lasers, as a first approach to the study of the microchip laser concept applied to several rare earth-doped crystalline hosts. The results on the study of the thermal lens, required for the microchip laser operation as well as the continuous wave and passive Q-switched laser operation in microchip configuration are reported. In the experiments, the microchip concept is defined as a quasi-monolithic laser cavity. Such a concept is studied for different laser emissions at ~1.06 μm from Yb3+ and Nd3+ ions, at ~1.3 μm from Nd3+, at ~1.95 μm from Tm3+ and at ~2.05 μm from Ho3+. The continuous wave regime is examined in detail for the above mentioned trivalent lanthanide ions embedded in several crystalline hosts with the aim to compare the potential of each gain material. Slope efficiencies very close to the theoretical limit are demonstrated in this work. On the other hand, microchip solid state lasers passively Q-switched with several saturable absorbers are also presented. For this purpose, novel nanomaterials such as MoS2, carbon nanostructures (SWCNTs, single- and multilayer graphene) and a SESA are used as saturable absorbers. Besides, the most conventional Cr:YAG (~1.06 μm) and Cr:ZnS (~1.9 μm) are examined to compare their performance.
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Kifle, Esrom Aschenaki. "Fabrication and characterization of waveguide lasers operating in the infrared spectral range." Doctoral thesis, Universitat Rovira i Virgili, 2019. http://hdl.handle.net/10803/668351.

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Aquest treball de tesi ha tractat la fabricació i la caracterització de làsers de guia d’ona compactes i eficients que funcionen en règims d’ona contínua i Q-commutat de forma passiva al voltant dels 2 micròmetres en l’espectre electromagnètic. Per aconseguir-los, es van utilitzar materials cristal•lins basats en tungstats dobles d’estructura monoclínica dopats amb erbi (Er3+), tuli (Tm3+) o holmi (Ho3+). Aquests materials làser es van escollir per les seves propietats òptiques d’emissió i absorció que els fan aptes per aconseguir dispositius compactes. Per a la fabricació i l'estructuració de les guies d'ona, es va utilitzar la combinació dels següents mètodes: creixement cristal•lí en solució a alta temperatura, creixement d’epitàxies en fase líquida, tall amb serra micromètrica de diamant i escriptura directa per làser de femtosegons. A més, es van implementar diferents tècniques de caracterització com la microscòpia confocal, μ-Raman i μ-luminescència per avaluar la qualitat i la idoneïtat de les guies d'ones. En el règim d’ona Q-commutat de forma passiva, es va estudiar la idoneïtat de diferents absorbidors saturables, com ara cristalls de ZnSe o ZnS dopats amb Cr2+, MoS2 i nanoestructures de carboni (grafè i els nanotubs de carboni) dipositats sobre un substrat transparent o directament a la superfície de la mostra que contenia les guies d'ones. La fabricació d’una guia d’ona acanalada superficial mitjançant creixement epitaxial va donar com a resultat una eficiència làser rècord gairebé aproximada al límit teòric. Es van fabricar i estudiar guies d'ones soterrades (canals) fabricades mitjançant un làser de femtosegon. Igualment, es van fabricar i estudiar guies d'ona acanalades en superfície (forma d'anell) i separadors en forma de Y. Finalment, es van demostrar làsers de guia d’ona capaços d’oferir una potència de sortida de nivell de watts, així com làsers de guia d’ona en règim Q-commutat de forma passiva molt estable.
Este trabajo de tesis ha tratado la fabricación y caracterización de láseres de guía de onda compactos y eficientes que funcionan en los regímenes de onda continua y Q-conmutado de forma pasiva alrededor de los 2 micrómetros en el espectro electromagnético. Para lograrlos, se emplearon materiales cristalinos basados en tungstatos dobles de estructura monoclínica dopados con erbio (Er3+), tulio (Tm3+) u holmio (Ho3+). Los medios de ganancia fueron elegidos debido a sus propiedades ópticas de emisión y absorción que los hacen adecuados para lograr dispositivos compactos. Para la fabricación y estructuración de las guías de onda se utilizó una combinación de los métodos: crecimiento cristalino en solución a alta temperatura, crecimiento epitaxial en fase líquida, corte con sierra micrométrica de diamante y escritura directa por láser de femtosegundo. Además, se implementaron diferentes técnicas de caracterización, como la microscopía confocal, μ-Raman y μ-luminiscencia para evaluar la calidad y la idoneidad de las guías de onda. En el régimen de operación Q-conmutado pasivo, se estudió la idoneidad de diferentes absorbentes saturables, como los cristales de ZnSe o ZnS dopados con Cr:2+, el MoS2 y las nanoestructuras de carbono (grafeno y los nanotubos de carbono) depositados sobre un sustrato transparente o directamente sobre la superficie de la muestra que contiene las guías de onda. La fabricación de una guía de onda acanalada superficial mediante crecimiento epitaxial resultó en una eficiencia láser récord muy próximo al límite teórico. Se fabricaron y estudiaron guías de onda enterradas fabricadas mediante escritura con láser de femtosegundo. Se fabricaron y estudiaron guías de onda acanaladas en superficie (revestimiento en forma de anillo) y divisores en forma de Y. Finalmente, se demostraron láseres de guía de onda capaces de generar una potencia de salida de vatios, así como láseres de guía de onda en régimen Q-conmutado pasivamente muy estable.
This thesis work has dealt with the fabrication and the characterization of compact and efficient waveguide lasers operating in the continuous wave and passively Q-switched operation regimes around 2 μm in the spectral range. To achieve those, erbium (Er3+), thulium (Tm3+) or holmium (Ho3+) doped monoclinic double tungstate crystalline materials were employed. The gain media were chosen due to their ability to generate polarized laser emission and their large gain cross-sections which make them suitable for achieving compact devices. The combination of the top-seeded solution growth, liquid phase epitaxy, diamond saw dicing and femtosecond direct laser writing methods were employed for fabricating and structuring the waveguides. Furthermore, different characterization techniques such as confocal microscopy, μ-Raman, and μ-luminescence mapping were implemented to assess the quality and suitability of the fabricated waveguides for lasing application. In the passively Q-switched operation regime, the suitability of different saturable absorbers such as transition-metal-doped chalcogenide crystals (Cr2+:ZnSe or ZnS), few-layer transition metal dichalcogenide (MoS2) and carbon nanostructures such as graphene and single-walled carbon nanotubes deposited on a transparent substrate or directly onto the surface of the sample containing the waveguides were tested. The fabrication of an epitaxially grown surface channel waveguide resulted in a record slope efficiency almost approaching the theoretical limit. Femtosecond laser written buried channel waveguides (with circular and hexagonal optical-lattice-like cladding), surface channel waveguides (with half-ring-shaped cladding) and Y-branch splitters were fabricated and studied. Waveguide lasers capable of delivering a watt-level output power as well as those with a stable passive Q-switching operation were demonstrated.
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Books on the topic "Lasure"

1

Marshall, Thelma Leasure. Descendants of Abraham Le Sueur the Huguenot: Lasher-Lasure-Lesure-Lazear-Leasure-Leisura, La Sueur and allied families of America. Great Falls, Mont: Licinis Printers, 1991.

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Winburn, D. C. What every engineer should know about lasers. New York: M. Dekker, 1987.

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Atomic physics of lasers. London: Taylor & Francis, 1986.

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Ball, Kay. Lasers: The perioperative challenge. 3rd ed. Denver, CO: Acorn, 2004.

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Lasers: The perioperative challenge. St. Louis: Mosby, 1990.

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Lasers: The perioperative challenge. 2nd ed. St. Louis: Mosby, 1995.

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Tomoyuki, Yatsuhashi, and Nihon Kagakkai, eds. Rēzā to kagaku. Tōkyō-to Bunkyō-ku: Kyōritsu Shuppan, 2012.

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Pyatakhin, M. V. Spatiotemporal characteristics of laser emission. Commack, N.Y: Nova Science Pub., 1994.

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Farley, Dixie. Laser treatment to go: Outpatient uses of healing light abound. Rockville, Md: Dept. of Health and Human Services, Public Health Service, Food and Drug Administration, Office of Public Affairs, 1988.

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Jelínková, Helena. Lasers for medical applications: Diagnostics, therapy, and surgery. Oxford: WP/Woodhead Publishing, 2013.

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Book chapters on the topic "Lasure"

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Nischwitz, Sebastian P., David B. Lumenta, Stephan Spendel, and Lars-Peter Kamolz. "Minimally Invasive Technologies for Treatment of HTS and Keloids: Pulsed-Dye Laser." In Textbook on Scar Management, 263–69. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44766-3_31.

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AbstractWe present another minimally invasive technology for the treatment of hypertrophic scars and keloids: the pulsed-dye laser. Being first introduced by two groups around Schaefer (Germany) and Sorokin & Lankard (USA) in 1966, the pulsed dye laser is a rather new technology. The first clinical use of pulsed-dye lasers was reported in 1983 for the treatment of naevus flammeus, and was the first laser used for the treatment of keloids in the mid-1990s.Its efficacy is based on the principle of selective photothermolysis, enabling a selective destruction of defined structures absorbing the respective wavelength used, as compared to other lasers working based on thermal coagulation or ablative tissue interaction. The preferred wavelengths being used are 585 or 595 nm, which makes small cutaneous vessels the main targets. Their destruction leads to a diminished blood supply of the irradiated area, thus reducing symptoms of hypertrophic scars like itching, vascularity, and redness, and secondary – probably by the induced hypoxemia – a reduction in scar height and pliability. This therapeutic approach also implies the use of pulsed-dye laser in the prevention of pathologic scars. While significant side effects are usually rare, slight signs of use like edema or scab formation can pertain for several days. Since the sensory impact of laser pulses are comparable to needle pricks, some form of analgesia during the application is highly recommended. The elusive data and still existing scarcity of high-quality studies on the use of pulsed-dye laser, however, make it hard to develop clear recommendations.
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Sigrist, Markus Werner. "Chemische Laser (chemical lasers)." In Laser: Theorie, Typen und Anwendungen, 399–402. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-57515-4_17.

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Kneubühl, Fritz Kurt, and Markus Werner Sigrist. "Chemische Laser (chemical lasers)." In Teubner Studienbücher Physik, 380–84. Wiesbaden: Vieweg+Teubner Verlag, 2005. http://dx.doi.org/10.1007/978-3-322-99688-6_17.

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Kneubühl, Fritz Kurt, and Markus Werner Sigrist. "Chemische laser (chemical lasers)." In Laser, 386–90. Wiesbaden: Vieweg+Teubner Verlag, 1989. http://dx.doi.org/10.1007/978-3-322-91806-2_17.

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Kneubühl, Fritz Kurt, and Markus Werner Sigrist. "Chemische Laser (chemical lasers)." In Laser, 380–84. Wiesbaden: Vieweg+Teubner Verlag, 1999. http://dx.doi.org/10.1007/978-3-322-93875-6_17.

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Poetschke, Julian, and Gerd G. Gauglitz. "Hyperpigmented Scar." In Textbook on Scar Management, 505–7. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44766-3_58.

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AbstractMultiple studies on the use of different wave lengths for the improvement of hypertrophic scars and keloids have been published over recent years. To date, most data and experience exist regarding the use of vascular lasers (pulsed-dye-laser, PDL; Neodym-YAG, Nd:YAG), intense pulsed light (IPL), and fractional (ablative) lasers. However, with growing awareness in this area, an increasing number of patients are seeking help for the amelioration of pigmentary changes associated with existing scars or for postinflammatory hyperpigmentation resulting from previous therapies. Here, we present a female patient in her early 20s, who suffered from a deep dermal burn with a resulting hypertrophic scar on her left lower leg, which showed distinct hypertrophy as well as significant hyperpigmentation.
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Stafe, Mihai, Aurelian Marcu, and Niculae N. Puscas. "Lasers for Pulsed Laser Ablation." In Springer Series in Surface Sciences, 15–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40978-3_2.

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Kane, T. J., and R. L. Byer. "Miniature Laser Diode Pumped Nd:YAG Lasers." In Tunable Solid State Lasers for Remote Sensing, 38–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-540-39765-6_10.

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Machado-Pinto, Jackson, and Michelle dos Santos Diniz. "Ablative Lasers (CO2 Laser) for Photorejuvenation." In Lasers, Lights and Other Technologies, 1–6. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-20251-8_11-1.

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Burlamacchi, Pio. "Excimer Lasers : Practical Excimer Laser Sources." In Physics of New Laser Sources, 15–31. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4757-6187-0_2.

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Conference papers on the topic "Lasure"

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Zhang, Wenwu, Junke Jiao, Liang Ruan, and Tianrun Zhang. "Experimental Study on Laser High-Speed Micro-Processing." In ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-4065.

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To study the characteristics of material removal with high power ultra-short pulsed lasers, a 300 W picosecond laser was used to make microgrooves in cooper and steel. The effects of laser power, laser frequency, scanning layers, and scanning velocity on the width and depth of the grooves were analyzed. The material removal rate of picosecond laser was compared with that of a 10 W nanosecond laser. The results showed that high power high frequency ultra-short pulsed lasers have good potential in high speed micromachining. Evidence showed that ps laser machining could be more efficient than nanosecond machining. There are issues to be solved to make high power ultra-short pulsed lasers the dominating process for high speed micromachining.
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Jiang, Lan, and Hai-Lung Tsai. "Modeling of CO2 Gas Excitation Under CO2 Laser Irradiation." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15625.

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Lasers especially multiple laser beams demonstrate unique advantages as energy sources in diamond synthesis. However, the fundamental mechanisms involved in the laser-assisted processes are not Well understood. In a reported amazingly-fast multiple laser coating technique, CO2 gas is claimed as the sole precursor or secondary precursor, which remains poorly understood and unverified. The absorption coefficient changes under the irradiation of the multiple lasers are one of the keys to resolve the mysteries of multiple laser beam coating processes. This study investigates the optical absorption in CO2 gas at the CO2 laser wavelength. This resonance absorption process is modeled as an inverse process of the lasing transitions of CO2 lasers. The well-established CO2 vibrational-rotational energy structures are used as the basis for the calculations with the Boltzmann distribution for equilibrium states and the three-temperature model for non-equilibrium states. Based on the population distribution, our predictions of CO2 absorption coefficient changes as the function of temperature are in agreement with the published data.
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Refai-Ahmed, Gamal, and Stephanie Trottier. "Thermal Behavior of Next Generation of Raman Pump Lasers in Telco Equipment." In ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35129.

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The present investigation concluded that the thermal behavior of the laser diode can be numerically modeled using the parabolic transient conduction equation. In addition, the current study compared the thermal performance of the continuous wave pump lasers versus the modulated wave pump lasers. This comparison revealed that the temperature of the modulated wave pump laser can approach the temperature of the continuous wave pump laser with the same average power dissipation when the frequency approaches infinity. Finally, the resulting thermal behavior was correlated and expressed in an empirical form, which physically described the thermal performance of the modulating pump laser.
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Lei, Shuting, Xin Zhao, Xiaoming Yu, Anming Hu, Sinisa Vukelic, Martin B. G. Jun, Hang-Eun Joe, Y. Lawrence Yao, and Yung C. Shin. "Ultrafast Laser Applications in Manufacturing Processes: A State of the Art Review." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2968.

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Abstract With the invention of chirped pulse amplification for lasers in the mid-1980s, high power ultrafast lasers entered into the world as a disruptive tool, with potential impact on a broad range of application areas. Since then, ultrafast lasers have revolutionized laser-matter interaction and unleashed their potential applications in manufacturing processes. With unprecedented short pulse duration and high laser intensity, focused optical energy can be delivered to precisely defined material locations on a time scale much faster than thermal diffusion to the surrounding area. This unique characteristic has fundamentally changed the way laser interacts with matter and enabled numerous manufacturing innovations over the past few decades. In this paper, an overview of ultrafast laser technology with an emphasis on femtosecond laser is provided first, including its development, type, working principle, and characteristics. Then ultrafast laser applications in manufacturing processes are reviewed, with a focus on micro/nano machining, surface structuring, thin film scribing, machining in bulk of materials, additive manufacturing, bio manufacturing, super high resolution machining, and numerical simulation. Both fundamental studies and process development are covered in this review. Insights gained on ultrafast laser interaction with matter through both theoretical and numerical research are summarized. Manufacturing process innovations targeting various application areas are described. Industrial applications of ultrafast laser based manufacturing processes are illustrated. Finally, future research directions in ultrafast laser based manufacturing processes are discussed.
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Wishon, Michael Joe, Daeyoung Choi, Tobias Niebur, Nathan Webster, Yanne K. Chembo, Evgeny A. Viktorov, David Citrin, and Alexandre Locquet. "External-cavity based optoelectronic oscillator stabilization (Conference Presentation)." In Semiconductor Lasers and Laser Dynamics, edited by Krassimir Panajotov, Marc Sciamanna, and Rainer Michalzik. SPIE, 2018. http://dx.doi.org/10.1117/12.2306088.

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Li, Nianqiang, Hadi Susanto, Benjamin Cemlyn, Ian Henning, and Michael Adams. "Injection locking of two laterally-coupled semiconductor laser arrays." In Semiconductor Lasers and Laser Dynamics, edited by Krassimir Panajotov, Marc Sciamanna, and Rainer Michalzik. SPIE, 2018. http://dx.doi.org/10.1117/12.2306158.

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Pusch, Tobias, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann, Rainer Michalzik, and Sebastian Scherübl. "Thermally-induced birefringence in VCSELs: approaching the limits." In Semiconductor Lasers and Laser Dynamics, edited by Krassimir Panajotov, Marc Sciamanna, and Rainer Michalzik. SPIE, 2018. http://dx.doi.org/10.1117/12.2306215.

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Eisenstein, Gadi. "How short time scales substitute for cryogenic cooling: quantum coherent effect in room temperature QD amplifiers (Conference Presentation)." In Semiconductor Lasers and Laser Dynamics, edited by Krassimir Panajotov, Marc Sciamanna, and Rainer Michalzik. SPIE, 2018. http://dx.doi.org/10.1117/12.2306218.

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Kryzhanovskaya, Natalia V., Eduard Moiseev, Yuliya Polubavkina, Mikhail Maximov, Andrey Lipovskii, Mingchu Tang, Mengya Liao, et al. "Continuous wavelength operation of injection III-V microdisk lasers directly grown on Si substrate with emission wavelength beyond 1.2 µm (Conference Presentation)." In Semiconductor Lasers and Laser Dynamics, edited by Krassimir Panajotov, Marc Sciamanna, and Rainer Michalzik. SPIE, 2018. http://dx.doi.org/10.1117/12.2306225.

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Bader, Sven, Mohamed Elattar, Philipp Gerlach, and Rainer Michalzik. "Optical manipulation of current confinement in VCSELs with an external laser beam." In Semiconductor Lasers and Laser Dynamics, edited by Krassimir Panajotov, Marc Sciamanna, and Rainer Michalzik. SPIE, 2018. http://dx.doi.org/10.1117/12.2306239.

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Reports on the topic "Lasure"

1

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA. Laser Diode Pumped Solid State Lasers. Fort Belvoir, VA: Defense Technical Information Center, January 1987. http://dx.doi.org/10.21236/ada251815.

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Dunn, J., A. L. Osterheld, J. R. Hunter, and V. N. Shlyaptsev. Development of short pulse laser pumped x-ray lasers. Office of Scientific and Technical Information (OSTI), February 2000. http://dx.doi.org/10.2172/15005094.

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Deri, R. Semiconductor Laser Diode Pumps for Inertial Fusion Energy Lasers. Office of Scientific and Technical Information (OSTI), January 2011. http://dx.doi.org/10.2172/1018822.

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Shirley, Lyle G., and Gregory R. Hallerman. Applications of Tunable Lasers to Laser Radar and 3D Imaging. Fort Belvoir, VA: Defense Technical Information Center, February 1996. http://dx.doi.org/10.21236/ada306557.

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Jingwen, Sun. Laser Guide Stars: Bridge of Ground-based Lasers Entering Space. Fort Belvoir, VA: Defense Technical Information Center, September 1992. http://dx.doi.org/10.21236/ada256649.

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Gibson, Steve, and Tsu-Chin Tsao. Control, Filtering and System Identification for High Energy Lasers and Laser Communications. Fort Belvoir, VA: Defense Technical Information Center, January 2012. http://dx.doi.org/10.21236/ada565747.

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Eason, Robert W. Pulsed Laser Deposition of Thin Films for Lasers and Quasi-Phase Matched Devices. Fort Belvoir, VA: Defense Technical Information Center, January 2013. http://dx.doi.org/10.21236/ada580984.

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Leger, J. R., and W. C. Goltsos. Geometrical Transformation of Linear Diode-Laser Arrays for Longitudinal Pumping of Solid-State Lasers. Fort Belvoir, VA: Defense Technical Information Center, May 1992. http://dx.doi.org/10.21236/ada253415.

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Lumpkin, A. H., D. W. Rule, LaBerge M. LaBerge M., and M. C. Downer. Observations on Microbunching of Electrons in Laser-Driven Plasma Accelerators and Free-Electron Lasers. Office of Scientific and Technical Information (OSTI), January 2019. http://dx.doi.org/10.2172/1596020.

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Possel, William H. Lasers and Missile Defense: New Concepts for Space-Based and Ground-Based Laser Weapons. Fort Belvoir, VA: Defense Technical Information Center, July 1998. http://dx.doi.org/10.21236/ada425537.

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