Relevant bibliographies by topics / Passive Q-switched

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  1. Journal articles
  2. Dissertations / Theses
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  4. Conference papers
  5. Reports

Academic literature on the topic 'Passive Q-switched'

Author: Grafiati
Published: 4 June 2025
Last updated: 15 July 2025

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Journal articles on the topic "Passive Q-switched"

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Che Mat, Fauziah, Moh Yasin, Anas Abdul Latiff, and Sulaiman Wadi Harun. "Graphene Oxide Film as Passive Q-switcher in Erbium-doped Fiber Laser Cavity." Photonics Letters of Poland 9, no. 3 (2017): 100. http://dx.doi.org/10.4302/plp.v9i3.755.

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All-fiber passively Q-switched fiber lasers have been demonstrated by using graphene oxide (GO) Q-switcher for possible applications in telecommunication, laser processing, fiber sensing and medical community. The GO material was obtained through a modified Hummers method from expanded acid washed graphite flakes and it was embedded into a polyvinyl alcohol (PVA) film to form a saturable absorber (SA) device. The Q-switched pulse operates at 1563.3 nm with a repetition rate that can be tuned from 44.33 kHz to 61.77 kHz as the pump power changes from 39 mW to 96 mW. The highest repetition rate of 61.77 kHz is achieved at a pump power of 96 mW and it is observed that the Q-switched pulse produced maximum pulse energy of 0.054 nJ and pulse width of 5.57 ?s at 96 mW pump power. Full Text: PDF ReferencesJ. Zayhowski and C. Dill, "Coupled-cavity electro-optically Q-switched Nd:YVO4 microchip lasers", Optics letters 20, 716 (1995). CrossRef C.-x. Gao, W. Zhao, Y.-s. Wang, S.-l. Zhu, G.-f. Chen, and Y.-g. Wang, "Passive Q-switched fiber laser with SESAM in ytterbium-doped double-clad fiber", 27th International congress on High-Speed Photography and Photonics, 62794G (2007). CrossRef M. Ahmed, N. Ali, Z. Salleh, A. Rahman, S. Harun, M. Manaf, "Q-switched erbium doped fiber laser based on single and multiple walled carbon nanotubes embedded in polyethylene oxide film as saturable absorber", Optics & Laser Technology 65, 25 (2015). CrossRef S. Harun, M. Ismail, F. Ahmad, M. Ismail, R. Nor, N. Zulkepely, et al., "A Q-switched erbium-doped fiber laser with a carbon nanotube based saturable absorber", Chinese Physics Letters 29, 114202 (2012). CrossRef A. Martinez and Z. Sun, "Nanotube and graphene saturable absorbers for fibre lasers", Nat Photon 7, 842 (2013). CrossRef J. Boguslawski, J. Sotor, G. Sobon, R. Kozinski, K. Librant, M. Aksienionek, et al., "Graphene oxide paper as a saturable absorber for Er- and Tm-doped fiber lasers", Photonics Research 3, 119 (2015). CrossRef H. Ahmad, F. D. Muhammad, M. Z. Zulkifli, and S. W. Harun, "Q-switched pulse generation from an all-f iber distributed Bragg reflector laser using graphene as saturable absorber", Chinese Optics Letters 11, 071401 (2013). CrossRef
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Siti, Nur Fatin Zuikafly, Farhah Razak Nor, Mohd Rosnan Rizuan, Wadi Harun Sulaiman, and Ahmad Fauzan. "Graphene slurry based passive Q-switcher in erbium doped fiber laser." Bulletin of Electrical Engineering and Informatics 8, no. 4 (2019): 1351–57. https://doi.org/10.11591/eei.v8i4.1609.

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In this work, a Graphene slurry based passive Q-switcher fabricated from Graphene-Polylactic acid (PLA) filament which is used for 3D printing. To produce the Graphene slurry, the diameter of the filament was reduced and Tetrahydrofuran (THF) was used to dissolve the PLA. The Graphene-THF suspension was drop cast to the end of a fiber ferrule and the THF then evaporated to develop Graphene slurry based SA which is integrated in fiber laser cavity. At threshold input pump power of 30.45 mW, a Q-switched Erbium-doped fiber laser (EDFL) can be observed with the wavelength centered at 1531.01 nm and this remained stable up to a pump power of 179.5 mW. As the pump power was increased gradually, an increase in the repetition rates was recorded from 42 kHz to 125 kHz, while the pulse width was reduced to 2.58 μs from 6.74 μs. The Q-switched laser yielded a maximum pulse energy and peak power of 11.68 nJ and 4.16 mW, respectively. The proposed Graphene slurry based saturable absorber also produced a signal-to-noise ratio of 44 dB indicating a stable Q-switched pulsed laser.
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Bezrodna, T. V., A. М. Negriyko, V. I. Bezrodnyi, I. V. Matsnev, L. F. Kosyanchuk, and O. I. Antonenko. "Efficient passive laser Q-switches based on dye-doped polyurethane for high-energy neodymium lasers." Semiconductor Physics, Quantum Electronics and Optoelectronics 28, no. 01 (2025): 083–92. https://doi.org/10.15407/spqeo28.01.083.

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This paper studies energy and time operation characteristics of a laser on a Nd3+:YAG crystal with passive Q-switches based on a dye-activated aliphatic polyurethane matrix with high radiation strength. A high efficiency of laser generation both in a free mode and at single pulse generation in the Q-switched regime is obtained using a samarium diffuse reflector with a BaSO4 filler. A single pulse energy and duration for the lasers with passive Q-switches based on organo-nickel complex BDN and polymethine dye IR-1061 in an aliphatic polyurethane matrix polymerized by the polycondensation method from 1.6-diisocyanatohexane, poly[di(ethylene glycol) adipate] and trimethylolpropane as starting components were compared. A powerful single pulse with an energy of ~1 J was obtained in the Q-switching mode using polymethine thiopyrylo-4-tricarbocyanine dye (IR-1061). The highly efficient Q-switching caused by the use of passive laser Q-switch based on the IR-1061 dye is shown to be due to its specific linear and nonlinear spectral properties.
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Md Johari, Md Ashadi, Aminah Ahmad, Mohd Fauzi Ab Rahman, Mohd Hafiz Jali, Haziezol Helmi Mohd Yusof, and Sulaiman Wadi Harun. "An Investigative Approach: Enhancing Q-Switched Fibre Laser using Molybdenum Aluminium Boride (MoAlB) Thin Film as Saturable Absorber." Journal of Advanced Research in Applied Mechanics 122, no. 1 (2024): 147–55. http://dx.doi.org/10.37934/aram.122.1.147155.

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Over the past decade, fibre laser technology has garnered significant technological focus and benefits. They improve the instability, affordability of maintenance, efficient heat dissipation, simplicity, and reliability of existing bulk lasers. Q-Switched fibre lasers have recently garnered significant attention. They possess the capacity to generate pulses with considerable energy levels, making them valuable for a range of applications such as micro-machining, biomedical imaging, communication, remote sensing, laser range finding, and medical surgery. Fibre lasers may generate ultra-short pulses at repetition rates of millions and thousands of cycles per second by functioning in the mode-locked or Q-switched states. Molybdenum Aluminium Boride (MoAlB) is employed as a saturable absorber for investigating the lasing properties of erbium-doped fibre. Moreover, a Q-switched EDF laser is observed utilising a MoAlB thin film as a saturable absorber in the 1.55µm wavelength range. The Q-switched fibre laser can be realised using either a passive or active technology. In this investigation, the passive approach is a suitable technique because using a saturable absorber (SA) for passive Q-switching simplifies cavity construction and eliminates the demand for external Q-switching electronics. The laser cavity was built utilising Erbium-Doped Fibre Laser as the gain medium. Increasing the pump power to 980 nm allows it to get results of Q-switched pulses running at 1550 nm.
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Zain, N. N. A. A. N., N. A. H. Jasni, W. M. F. W. Nawawi, and F. Ahmad. "COPPER-BASED 3D PRINTER FILAMENT AS PASSIVE Q-SWITCHER." Journal of Physics: Conference Series 2075, no. 1 (2021): 012003. http://dx.doi.org/10.1088/1742-6596/2075/1/012003.

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Abstract Using a copper-based saturable absorber (SA) and chitin as a biocompatible host polymer, this research effectively demonstrated the production of passive Q-switched in an erbium-doped fibre laser (EDFL). A Q-switched lasing was generated with a 100 kHz repetition rate and a pulse width of 4.60 µs. High pulse energy of 17.19 nJ was generated, with a respective instantaneous peak power of 3.51 mW.
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Liu Qiang, Gong Ma-Li, Yan Ping, Jia Wei-Fu, Cui Rui-Zhen, and Wang Dong-Sheng. "Study on passive Q switched Nd∶YVO—4 laser with GaAs asa passive Q switched component and output coupler." Acta Physica Sinica 51, no. 12 (2002): 2756. http://dx.doi.org/10.7498/aps.51.2756.

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Jasni, Nur Afiqah Husna, Siti Nur Fatin Zuikafly, Hafizal Yahaya, Mundzir Abdullah, and Fauzan Ahmad. "Graphene-Silver Based Passive Q-Switcher." Journal of Advanced Research in Materials Science 76, no. 1 (2021): 1–9. http://dx.doi.org/10.37934/arms.76.1.19.

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Pulsed fiber laser has gain massive attention among researchers. As one of the recognized methods in generating pulsed lasers, passive Q-switching technique in 1.5 micrometer region was used in this work. A graphene-silver composite (Gr-Ag) was integrated as the saturable absorber (SA) in this work. For ease of integration, a free-standing SA film was fabricated by using chitin as the host polymer. The pulsed fiber laser was generated within the input pump power of 135.7 mW to 181.5 mW. Distinct trends of repetition rate and pulse width was observed where the former shows an increasing trend and vice versa for the latter. At 181.5 mW, pulsed laser with repetition rate and pulse width at 59.97 kHz and 2.74 µs, respectively were recorded while the pulse energy and instantaneous peak power were at 5.64 nJ and 1.93 mW, respectively. The findings from this work have shown Gr-Ag SA as a suitable candidate in Q-switched pulsed laser generation.
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Pisani, Fedele, Pinghua Tang, Nicola Coluccelli, Paolo Laporta, and Gianluca Galzerano. "Passive Q-switched Dy:ZBLAN fibre laser at 3.1 µm." EPJ Web of Conferences 287 (2023): 10007. http://dx.doi.org/10.1051/epjconf/202328710007.

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The passive Q-switching performance of an in-band pumped Dy-doped fluorozirconate fibre laser emitting around 3.1 µm is investigated. Passively Q-switched laser operation is demonstrated employing semi-conductor saturable absorber mirrors. Stable operation is achieved, with a minimum pulse duration of 464 ns, a highest repetition frequency of 210 kHz and peak pulse powers up to 3 W.
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Nabihah, Hussin, Haniff Ibrahim Mohd, Ahmad Fauzan, Yahaya Hafizal, and Wadi Harun Sulaiman. "Graphene Nanoplatelets (GnP)-PVA Based Passive Saturable Absorber." TELKOMNIKA Telecommunication, Computing, Electronics and Control 15, no. 2 (2017): 814–19. https://doi.org/10.12928/TELKOMNIKA.v15i2.6126.

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A passive Q-switched pulsed laser at 1.5 m region incorporating graphene nanoplatelets (GnPs) embedded in Polyvinyl Alcohol (PVA) is demonstrated. A surfactant is used to aid the dispersion of the GnPs before it is mixed with PVA to develop a GnPs-PVA film based SA. The SA is integrated into the laser cavity by attaching a cut of the GnPs-PVA film in between two fiber ferrule of the laser ring cavity.The proposed GnPs-PVA film based passive Q–switched laser was able to operate as the input pump power was increased from 39 mW up to a maximum of 148 mW before diminishing. The laser obtained operated with a central wavelength of 1530.76 nm. Repetition rates were obtained at 33 kHz to 91.5 kHz, throughout the tunable input pump power with the shortest pulse width of 2.42 s. Maximum attainable peak power and pulse energy of 1.2 mW and 5.9 nJ, respectively, was recorded, accompanied by a signal to noise ratio (SNR) of 28 dB.
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Gao, Mingwei, Yibo Ding, Qing Wang, Lei Wang, Yuan Gao, and Chunqing Gao. "Low-Timing Jitter Single-Frequency Pulse Output from a Passively Q-Switched Monolithic Non-Planar Ring Oscillator." Photonics 11, no. 12 (2024): 1120. http://dx.doi.org/10.3390/photonics11121120.

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A low-timing jitter passively Q-switched monolithic non-planar ring oscillator (NPRO) with diffusion-bonded Cr4+: YAG in a single-frequency operation was realized. The pulse parameters were controlled by a Cr4+: YAG saturable absorber, while the single-frequency operation was ensured by the unidirectional ring cavity structure. The pulse trigger was actively provided by a gain switcher utilizing a composite pumping scheme. The dependence of the timing jitter between the output pulse and the trigger signal on the parameters of the composite pumping scheme was investigated both theoretically and experimentally. Using this approach, we achieved a single-frequency pulsed laser output with a timing jitter of 14.568 ns (RMS) at a repetition rate of 100 Hz corresponding to a pulse width of 5.99 ns. This novel Q-switched monolithic NPRO, which integrates the benefits of both active and passive Q-switching, results in a simple and reliable structure that achieves a low-timing jitter single-frequency pulse output.
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Dissertations / Theses on the topic "Passive Q-switched"

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Phelps, Charles Dustin. "Diode-Pumped, 2-Micron, Q-Switched Tm:YAG Microchip Laser." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1304695817.

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Segura, Sarmiento Martha Yamile. "Monoclinic tm:klu(w04)2: a new crystal for efficient diode-pumped continuous-wave and q-switched lasers." Doctoral thesis, Universitat Rovira i Virgili, 2012. http://hdl.handle.net/10803/80852.

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El doble tungstato cristalino de potasio y lutecio con estructura monoclínica, KLu(WO4)2, se ha establecido como una nueva matriz laser de estado sólido para iones de Tm, Yb y Ho debido a (i) las altas secciones eficaces de absorción y emisión; (ii) la relativamente larga distancia entre iones Lu-Lu permitiendo altos niveles de concentración de iones activos sin perdidas significativas por fluorescencia; y (iii) el tiempo de vida suficientemente largo del nivel emisor de la transición láser asegurando un alto almacenamiento de energía. Estas características son explotadas en este trabajo usando Tm como ion activo para generar emisión láser a 1.94 µm. El máximo local de absorción del agua a esta longitud de onda hace a este laser interesante para aplicaciones medicas y atmosféricas. Cambio de polarización, operación en dos longitudes de onda, laser vibrónico, diseño láser de capa delgada Thin-disk, Q-conmutado pasivo y la interacción láser-tejido del láser de Tm:KLu(WO4)2 a 1.94 µm son demostrados en este trabajo.<br>Monoclinic potassium lutetium double tungstate KLu(WO4)2 is established as new laser host for Tm, Yb and Ho active ions due to (i) its very high values of absorption and emission cross sections (ii) its relatively large Lu-Lu distances allowing high ion concentration with minimum fluorescence quenching effects and (iii) the long lifetime of the upper laser level ensuring high energy storage. These characteristics are exploited in this work using Tm as active ion to generate laser emission at 1.94 µm. The local maximum of water absorption at this wavelength makes this laser interesting for medical and atmospheric applications. Polarization switching, dual-wavelength operation, vibronic laser, thin-disk laser design, passive Q-switching and the laser-tissue interaction of the 1.94 µm Tm:KLu(WO4)2 laser are demonstrated in this work
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Lu, Min. "Performance of continuously pumped, passively Q-switched, solid state lasers." Thesis, University of Sussex, 2011. http://sro.sussex.ac.uk/id/eprint/6953/.

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This thesis studies the relationship between the pairs of resonator output coupling and intra-cavity absorber initial transmission, and the FWHM (full width at half maximum) pulse duration of a continuously pumped passively Q-switched solidstate laser, when the output energy is pre-determined. Depending on the magnitude of the pumping power, three different rate equation models are used to evaluate the required output coupler reflectivity and absorber initial-transmission pair for the corresponding FWHM pulse duration. The energy transfer kinetics of the passively Q-switched laser decides the required pumping power; and the pair of output coupler reflectivity absorber transmission pair, determine the build-up time of Q-switching and the repetition rate of the laser system. Hence, the forms of the models are controlled by two conditions: 1) the build-up time of Q-switching; and 2) the recovery time of the absorber. When the build-up time of Q-switching is relatively short, but the recovery time of the absorber is long, Model I is based on the simplified laser rate equations. It is used to evaluate the output coupler reflectivity and absorber initialtransmission pair, which satisfies the pre-determined output energy and FWHM pulse duration. Model II is set up to study the case when both the build-up time of Q-switching and the recovery time of the absorber are long. In Model II, the laser rate equations are solved using the Runge-Kutta method. Model III simulates the case when the recovery time of the absorber is short. To validate the models, the simulation results of practical passively Q-switched laser systems are compared with experimental results reported in the literature. The agreement of the simulation results with reported experimental results demonstrates the importance of the boundary conditions for the different cases, and verifies the soundness of the models. Generalizing the simulation results, obtained from different passively Q-switched laser systems with different pumping power and different pre-determined output energy, yields general conclusions which permit a designer to select the correct parameters for a desired laser performance.
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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.<br>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<br>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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Mercer, Colin. "Development of a Diode Laser Pumped Passively Q-Switched Laser Source for Range-Finding and Designating." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508559.

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El, bassri Farid. "Sources lasers déclenchées nanosecondes : Applications à la spectroscopie Raman cohérente sous champ électrique." Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0060/document.

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Du fait de leur compacité, leur robustesse et leur faible coût, les microlasers impulsionnels nanosecondes constituent des sources particulièrement attractives pour de nombreux systèmes de détection et d'analyse, en particulier les cytomètres en flux ou les dispositifs pour la spectroscopie CARS (Coherent Raman Anti Stokes Scattering). Cependant, ces applications nécessitent des performances améliorées en ce qui concerne la gigue temporelle et la cadence de répétition accessible. Dans sa première partie, cette thèse propose des solutions originales pour atteindre les performances requises à partir de microlasers passivement déclenchés, grâce à la mise en oeuvre d'une cavité hybride couplée, pompée par une onde modulée en intensité. Une cadence de répétition supérieure à 30 kHz avec une gigue demeurant inférieure à 200 ns est atteinte. Le potentiel de microlasers à fibres déclenchés par modulation du gain pour monter en cadence est aussi évalué, montrant que des impulsions à faible gigue, à une cadence de plus de 2 MHz peuvent être produites. Enfin, la dernière partie est consacrée à la mise au point et à l'exploitation d'un nouveau système de spectroscopie CARS assisté par une excitation électrique haute tension. Ce dispositif, réalisé à partir d'un microlaser amplifié, permet de s'affranchir du bruit de fond non résonnant des mesures et de réaliser une analyse spectroscopique fine de la réponse de différents milieux d'intérêt sous champ continu ou impulsionnel, pouvant conduire à une nouvelle méthode de microdosimétrie de champ. Diverses applications, dont la granulométrie à l'échelle micro ou nanométrique ou l'identification de marqueurs pour la biologie, sont démontrées<br>Thanks to their compactness, robustness and low cost, pulsed nanosecond microlasers are particularly attractive sources for different detection and analysis systems, particularly flow cytometers or devices for CARS (Coherent Anti Raman Stokes Scattering) spectroscopy. However, these applications require reduced time jitter and increased repetition rate. The first part of this thesis proposes novel solutions to achieve the required performance from passively Q-switched microlasers, which are based on an hybrid coupled-cavity and intensitymodulated pump wave. A repetition rate greater than 30 kHz with jitter remaining lower than 200 ns is reached. Pulsed fiber microlasers operating by gain switching are also studied, showing that pulses with low timing jitter, at a repetition rate of more than 2 MHz can be obtained. The last part is devoted to the development and the implementation of a new system of CARS spectroscopy assisted by a high-voltage electrical stimulation. This device, based on an amplified microlaser, allows to substract the non-resonant background noise in the measurements. Thus, a fine spectroscopic analysis of the response of different environments of interest in continuous or pulsed field can be achieved. It may lead to a new method for field microdosimetry. Various applications, including granulometry at the micro or nanometric scale and the identification of markers for biology, are shown
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Lavastre, Eric. "Déclenchement des microlasers solides émettant à 1,55 µm par un dispositif à semiconducteur." Université Joseph Fourier (Grenoble ; 1971-2015), 1998. http://www.theses.fr/1998GRE10173.

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Les microlasers emettant a 1,55 m sont des lasers solides de faible volume (<1 mm#3) a base de verre : er, yb dont les miroirs de la cavite sont directement deposes sur le milieu a gain. En introduisant un modulateur dans la cavite, il est possible de declencher le laser afin d'obtenir des impulsions de puissance crete elevee donc exploitables pour des applications telles que la telemetrie. L'objet de cette these est d'utiliser un dispositif a semiconducteur comme modulateur. De par leurs proprietes optiques et electriques, les semiconducteurs presentent un fort potentiel pour le declenchement passif et le declenchement actif. Les structures etudiees sont des couches epaisses et des structures a puits quantiques constituees d'in#xga#1##x##yal#yas epitaxiees sur un substrat d'inp. En declenchement passif dans une configuration microlaser, les meilleurs resultats ont ete obtenus avec une couche epaisse de 80 nm d'in#0#,#4#8ga#0#,#5#2as. Les energies et les puissances cretes par impulsion sont respectivement de 2 j et 2w avec un substrat d'inp semi-isolant et, 25 nj et 5w avec un substrat d'inp non dope. Ces differences dans les performances sont dues a des effets non-lineaires associes au substrat d'inp semi-isolant qui elargissent les impulsions. En declenchement actif, les premiers essais en cavite externe ont montre qu'il est possible de moduler l'emission laser en appliquant des creneaux de tension inferieurs a 20v pendant 1 s aux bornes d'une diode p. I. N dont la region intrinseque se compose de 10 puits quantiques d'in#0#,#5#3ga#0#,#4#7as dans des barrieres d'in#0#,#5#2al#0#,#4#8as. Afin d'optimiser l'effet du champ electrique, une structure mesa et une passivation ont ete realisees.
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Kun-GueiHong and 洪崑貴. "Dynamic behavior in the passive Q-switched Nd:YVO4 laser on pumping modulation." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/68080196281387953459.

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碩士<br>國立成功大學<br>光電科學與工程學系<br>100<br>n this thesis, we study that the nonlinear dynamical behavior in passively Q-switched Nd:YVO4 laser. With increasing the modulation frequency of pumping source, the behavior of the pulse train in sequence will occur: period two, period three, period one and finally chaotic dynamics phenomena with some path of development. At the same time when the modulation frequency was closed to the pulse repetition frequency, the timing jitter of pulse train became very stable, and the pulse width compared with pulse train without modulation was compressed. In simulation, we modulated gain with sine wave. All the dynamic behavior of the pulse train of simulation corresponded with experiment. It’s easy to analyze that some pulses of the pulse train have stronger excitation and become the stronger peak intensity, and some pulses become weaker one because of small excitation. This phenomena lead to be period two signal. So does the period three, and so dose chaotic pulse train. The Q-switched pulse laser system can be controlled into special condition by gain-modulation with some special frequency.
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Chen, Se-Jie, and 陳世杰. "Study of Passive and Active Q-Switched Intracavity Frequency-Doubled Solid State Laser." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/64496007136987231739.

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碩士<br>義守大學<br>電機工程學系<br>92<br>We have finished the theoretical analysis of active/passive Q-switched intracavity frequency doubled solid state laser without any sponsor or experimental equipments. With the analysis of plane E-M wave, the results of our model show that for a small compact laser cavity operating in TEM00 mode with single frequency output, the laser output energy and peak power will be greatly affected by both the ETU effect [15] caused by high pumping power and different ratio of pumping mode to laser mode. We also incorporate the pulse repetition frequency (PRF) [31,32] into the rate equation. Compared with experimental data, our theoretical predictions show great agreement with the experimental results of J. Liu [19]. Besides, the results show that the ETU effect are seriously increasing under the conditions of high pumping power and low PRF. We also study the passive saturable absorabler (SA) Q-switched laser. A second threshold condition [54] for intracavity double frequency is derived. However, the second threshold condition is not related to the second harmonic generation (SHG) crystal. We also use Lagrange multiplier method to obtain the optimal energy of intracavity SHG of Q-switched laser [53]. We hope some experiments can be set up to verify our predictions. In the near future, we will continue working on how to apply the second threshold condition to simplify the design of laser for optimal energy.
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Su, Huan-Rui, and 蘇桓銳. "Q-switched mode locking of Nd:YAG lasers by hybrid active and passive mechanisms." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/33598935719840420612.

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碩士<br>東海大學<br>物理學系<br>99<br>This thesis studies Q-switched mode locking of Nd:YAG lasers by using active mode-locked technique in combination of gain switched or passive Q-switched technique. In the gain-switched experiment, Q-switched mode-locked pulses were observed when the modulation frequency tuned to resonate with natural frequency of the laser system. A four to five times enhancement of peak power and an improvement of mode-locked performance can be obtained by applying active mode locking to the gain-switched experiment. In passive Q-switched experiment, we have also observed Q-switched mode-locked pulses. The conditions for generating Q-switched pulses by optimizing average output power, repetition rate, and peak power were studied. In these cases, Q-switched pulses with average output power as high as 12 mW, repetition rate up to 20 KHz, and pulse width as low as 200 ns were obtained. By applying active mode locking to passive Q-switched experiment, the mode-locked performance improvement together with a three times increment of peak power could also be achieved.
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Book chapters on the topic "Passive Q-switched"

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Lorenz, Sebastian, Mark Bärwinkel, Wolfgang Mühlbauer, and Dieter Brüggemann. "Pulse Train Ignition with Passively Q-Switched Laser Spark Plugs Under Engine-like Conditions." In Ignition Systems for Gasoline Engines. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45504-4_15.

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Mahmud, Nik N. H. E. N., Noor A. Awang, Nurul I. Rasli, and Hatijah Basri. "Passively Q-Switched Erbium-Doped Fiber Laser Based on PSF-ZnO-TiO2 Nanoparticles as Saturable Absorber." In Springer Proceedings in Physics. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8903-1_1.

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Ismail, Mohd Afiq, Sulaiman Wadi Harun, Harith Ahmad, and Mukul Chandra Paul. "Passive Q-switched and Mode-locked Fiber Lasers Using Carbon-based Saturable Absorbers." In Fiber Laser. InTech, 2016. http://dx.doi.org/10.5772/61703.

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Zayhowski, J. J. "Passively Q-Switched Microchip Lasers." In Solid-State Lasers and Applications. CRC Press, 2017. http://dx.doi.org/10.1201/9781420005295-1.

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Zayhowski, J. "Passively Q-Switched Microchip Lasers." In Optical Science and Engineering. CRC Press, 2006. http://dx.doi.org/10.1201/9781420005295.ch1.

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Lncrnjan, I., R. Savastru, D. Savastru, and S. Miclo. "Numerical Simulation of Passively Q-Switched Solid State Lasers." In Numerical Simulation - From Theory to Industry. InTech, 2012. http://dx.doi.org/10.5772/47812.

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Dong, Jun, Ken-ichi Ueda, Hideki Yagi, and Alexander A. "Concentration-Dependent Laser Performance of Yb:YAG Ceramics and Passively Q-switched Yb:YAG/Cr,Ca:YAG Lasers." In Advances in Solid State Lasers Development and Applications. InTech, 2010. http://dx.doi.org/10.5772/7943.

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Conference papers on the topic "Passive Q-switched"

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Zheng, Duhang, Shipeng Liu, Shumeng Wu, Sirui Zhang, Shikun Sun, and Zimu Wang. "Optimizing laser active Q-switched through a few-layer WS2 passive saturable absorber." In Nineteenth National Conference on Laser Technology and Optoelectronics, edited by Qiang Liu. SPIE, 2024. http://dx.doi.org/10.1117/12.3036924.

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Guo, Baoping, Jared Hudock, Beiming Zhou, Nick Acero-Blyshak, Josh Foster, and Susanne Lee. "Acousto-optic and passive Q-switched, energetic compact 1.54um laser transmitter design and performance." In Solid State Lasers XXXIV: Technology and Devices, edited by W. Andrew Clarkson and Ramesh K. Shori. SPIE, 2025. https://doi.org/10.1117/12.3038728.

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Dupont, Hippolyte, Matthieu Glasset, Pavel Loiko, Patrick Georges, and Frédéric Druon. "On Chaos and Instability Dynamics of a Passively Q-switched Mid-Infrared Tm:YLF Laser." In Advanced Solid State Lasers. Optica Publishing Group, 2024. https://doi.org/10.1364/assl.2024.jw2a.26.

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A 2.3-µm Tm:YLF laser passively Q-switched by Cr2+:ZnSe is prone to chaotic behavior. We analyze this atypical chaotic dynamic using a consecutive cascade laser at 2.3 µm and 1.9 µm as a sensitive tool.
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Ince, Faik Derya, Yagiz Morova, Mauro Tonelli та Alphan Sennaroglu. "Upconversion Pumped Tm3+:KY3F10 Channeled Waveguide Laser at 2.3 μm and 1.9 μm". У Advanced Solid State Lasers. Optica Publishing Group, 2024. https://doi.org/10.1364/assl.2024.aw6a.3.

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We demonstrate, for the first time, a femtosecond laser written Tm3+:KY3F10 waveguide laser at 2.3 μm in continuous-wave regime and at 1.9 µm in continuous-wave and passively Q-switched regimes by upconversion pumping at 1064 nm.
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Bae, Ji Eun, Pavel Loiko, Fabian Rotermund, Gurvan Brasse, Alain Braud, and Patrice Camy. "Highly-efficient Tm:LiYF4 Waveguide Laser Passively Q-switched by Carbon Nanotubes." In Advanced Solid State Lasers. Optica Publishing Group, 2024. https://doi.org/10.1364/assl.2024.am3a.2.

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A Tm:LiYF4 diamond-saw-diced channel waveguide laser passively Q-switched by a single-walled carbon nanotube saturable absorber delivers 1.30 W at 1885 nm with a slope efficiency of 64.2% emitting 45-ns/0.87-μJ pulses at 1.50-MHz repetition rate.
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Ayevi, Berke, Yagiz Morova, Eugenio Damiano, Mauro Tonelli та Alphan Sennaroglu. "Efficient Continuous-Wave and Passively Q-switched Operations of a Femtosecond Laser Inscribed Tm/Ho:YLF Waveguide Laser at 2.05 μm". У Advanced Solid State Lasers. Optica Publishing Group, 2024. https://doi.org/10.1364/assl.2024.jw2a.4.

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We describe the continuous-wave(CW) and passively Q-switched(PQS) operations of a femtosecond laser written 2.05-μm Tm/Ho:YLF waveguide laser, yielding a high CW efficiency of 38% and 64-kHz pulses as short as 25 ns during PQS operation.
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Cho, Chun-Yu. "Exploring the second threshold criterion of the Nd:YVO4 passively Q-switched laser with temperature-elevating." In Advanced Solid State Lasers. Optica Publishing Group, 2024. https://doi.org/10.1364/assl.2024.jtu2a.15.

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To reach the second threshold criterion for the Nd:YVO4 passively Q-switched laser with a Cr4+:YAG saturable absorber, the method of temperature-elevating for decreasing emission cross section with a proper gain-medium-to-absorber-mode-size-ratio resonator is explored.
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Bruneteau, Baptiste, Hwan Hong Lim, and Takunori Taira. "Highly-stable 1064 nm laser for high-fidelity quantum-operations." In Advanced Solid State Lasers. Optica Publishing Group, 2024. https://doi.org/10.1364/assl.2024.jw2a.37.

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Design of a high-brightness 1064 nm laser is presented. It deals with passively-Q-switched lasers’ timing-jitter through injection seeding, with pulse-to-pulse energy instability by amplification in saturated regime and with thermal effects in amplifier using Distributed-Face-Cooling.
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Thony, Ph, B. Ferrand та E. Molva. "1.55 μm passive Q-switched microchip laser". У Advanced Solid State Lasers. OSA, 1998. http://dx.doi.org/10.1364/assl.1998.ls2.

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HUANG, CHUYUN, CHENGXIAN DENG, YUCHENG YAO, and ZHENGJIA LI. "MODELING OF PASSIVE Q-SWITCHED Tm:Ho LASER." In Proceedings of the 6th International Conference on Photonics and Imaging in Biology and Medicine (PIBM 2007). WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812832344_0051.

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Reports on the topic "Passive Q-switched"

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Zayhowski, John J., Colby Dill, Cook III, Daneu Chris, and John L. Mid- and High-Power Passively Q-Switched Microchip Lasers. Defense Technical Information Center, 1999. http://dx.doi.org/10.21236/ada373717.

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Zameroski, Nathan D., Michael Clement Wanke, and David J. Bossert. Cavity length dependence of mode beating in passively Q-switched Nd-solid state lasers. Office of Scientific and Technical Information (OSTI), 2012. http://dx.doi.org/10.2172/1055620.

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