Relevant bibliographies by topics / Infrared pulses / Dissertations / Theses
To see the other types of publications on this topic, follow the link: Infrared pulses.

Dissertations / Theses on the topic 'Infrared pulses'

Author: Grafiati
Published: 28 May 2022
Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Infrared pulses.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Austin, Drake Ross. "Semiconductor Surface Modification using Mid-Infrared, Femtosecond Laser Pulses." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu150324882632046.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kean, Peter N. "Generation and nonlinear propagation of ultrashort near infrared laser pulses." Thesis, University of St Andrews, 1990. http://hdl.handle.net/10023/14317.

Full text
Abstract:
By utilising a CW mode-locked Nd:YAG pump laser an experimental study of self-phase modulation (SPM) and stimulated Raman scattering (SRS) in single mode optical fibres has been conducted. The dependence of the spectral broadening due to SPM upon the launched optical power was observed to obey a linear relationship in agreement with a simple theory. A deviation from this occurred for high input powers due to the onset of stimulated Raman scattering which caused a preferential depletion of the leading edge of the pump pulse and an increased spectral broadening to the long wavelength side of the
APA, Harvard, Vancouver, ISO, and other styles
3

Knittel, Joachim. "Truncation of mid- and far-infrared laser pulses with plasma shutters /." [S.l.] : [s.n.], 1994. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10841.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Qin, Yu. "Versatility of nonlinear optical phenomena induced by infrared pulses: application to pulse characterization, element analysis, and filamentation." Kyoto University, 2015. http://hdl.handle.net/2433/200464.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Chan, Kin Foong. "Pulsed infrared laser ablation and clinical applications /." Digital version:, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p9992765.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Gwosch, Eva Christina [Verfasser]. "Modification of nuclear DNA by infrared femtosecond laser pulses / Eva Christina Gwosch." Konstanz : KOPS Universität Konstanz, 2017. http://d-nb.info/1191693880/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Schuh, K., M. Kolesik, E. M. Wright, J. V. Moloney, and S. W. Koch. "Self-Channeling of High-Power Long-Wave Infrared Pulses in Atomic Gases." AMER PHYSICAL SOC, 2017. http://hdl.handle.net/10150/623047.

Full text
Abstract:
We simulate and elucidate the self-channeling of high-power 10 mu m infrared pulses in atomic gases. The major new result is that the peak intensity can remain remarkably stable over many Rayleigh ranges. This arises from the balance between the self-focusing, diffraction, and defocusing caused by the excitation induced dephasing due to many-body Coulomb effects that enhance the low-intensity plasma densities. This new paradigm removes the Rayleigh range limit for sources in the 8-12 mu m atmospheric transmission window and enables transport of individual multi-TW pulses over multiple kilomete
APA, Harvard, Vancouver, ISO, and other styles
8

Kornaszewski, Lukasz. "Novel sources of near- and mid-infrared femtosecond pulses for applications in gas sensing, pulse shaping and material processing." Thesis, Heriot-Watt University, 2008. http://hdl.handle.net/10399/2224.

Full text
Abstract:
In this thesis the design, construction process and the performance of two femtosecond optical parametric oscillators and one second–harmonic generation femtosecond pulse shaper is described. One oscillator was applied to gas sensing while potential applications of other devices are outlined. ATi:sapphire oscillator was used to pump a periodically–poled lithium niobate– based optical parametric oscillator. This signal–resonant device was configured to produce broadband idler pulses tunable in the range of 2.7–3.4 μm. This wavelength coverage was matched to the ν3 optical absorption band of met
APA, Harvard, Vancouver, ISO, and other styles
9

Schuh, K., P. Rosenow, M. Kolesik, E. M. Wright, S. W. Koch, and J. V. Moloney. "Nonlinear rovibrational polarization response of water vapor to ultrashort long-wave infrared pulses." AMER PHYSICAL SOC, 2017. http://hdl.handle.net/10150/625977.

Full text
Abstract:
We study the rovibrational polarization response of water vapor using a fully correlated optical Bloch equation approach employing data from the HITRAN database. For a 10-mu m long-wave infrared pulse the resulting linear response is negative, with a negative nonlinear response at intermediate intensities and a positive value at higher intensities. For a model atmosphere comprised of the electronic response of argon combined with the rovibrational response of water vapor this leads to a weakened positive nonlinear response at intermediate intensities. Propagation simulations using a simplified
APA, Harvard, Vancouver, ISO, and other styles
10

Ruff, Zachary. "Photonic bandgap fibers for transmitting high peak-power pulses in the near infrared." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59249.

Full text
Abstract:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2010.<br>Includes bibliographical references (p. [41-42]).<br>Hollow-core photonic bandgap fibers (PBG) offer the opportunity to suppress highly the optical absorption and nonlinearities of their constituent materials, which makes them viable candidates for transmitting high-peak power pulses. This thesis demonstrates the fabrication and characterization of polymer-composite PBG fibers in a novel materials system, polycarbonate and arsenic sulfide glass. Propagation losses for the 60pm-core fibers
APA, Harvard, Vancouver, ISO, and other styles
11

Pullen, Michael Gregory. "Above Threshold Ionisation of Atomic Hydrogen using Few-Cycle Pulses." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/366071.

Full text
Abstract:
The interaction of intense few-cycle infrared laser pulses with matter is the fundamental process at the heart of attosecond science, which is the study of phenomena with duration below 10−15 seconds. Few-cycle laser pulses, which have durations in the femtosecond regime, have previously been used to reveal and control the structure and dynamics of atoms, molecules and solids. The physical interpretation of such experiments relies on the accurate simulation of the complex, highly nonlinear material dynamics during the few-cycle laser pulse. The future of attosecond science thus depends on the
APA, Harvard, Vancouver, ISO, and other styles
12

Ališauskas, Skirmantas. "Infrared Few-Cycle Pulse Optical Parametric Amplifier." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101001_145118-06284.

Full text
Abstract:
Main objective of this thesis is to generate and amplify few cycle pulses in the infrared region. In this thesis, two approaches were introduced for few cycle pulse parametric amplification at 800 nm and 1.5 μm. First approach is dedicated for prospects for increasing average power of OPCPA via multi-beam pumping; the second approach is dedicated for generation of carrier-envelope-phase (CEP) stable high energy (up to tens of millijoules) few-cycle pulses at 1.5 μm. An experimental investigation of two or three beams-pumped OPCPA system based on type I BBO crystal is presented. The 2nd OPA sta
APA, Harvard, Vancouver, ISO, and other styles
13

Depetri, William Iunes 1991. "Nonlinear conversion of ultrashort laser pulses into the mid-infrared = Conversão não-linear de pulsos laser ultracurtos para o infravermelho médio." [s.n.], 2016. http://repositorio.unicamp.br/jspui/handle/REPOSIP/305736.

Full text
Abstract:
Orientador: Flávio Caldas da Cruz<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-30T22:47:31Z (GMT). No. of bitstreams: 1 Depetri_WilliamIunes_M.pdf: 11907943 bytes, checksum: 4f7cedccb63e0fd32bea356921cb78f6 (MD5) Previous issue date: 2016<br>Resumo: Pentes de frequência ópticos têm sido desenvolvidos para medias de precisão e metrologia, mas tabém vêm ganhando interesse para espectroscopia de precisão de banda larga. Pentes ópticos no infravermelho médio são muito atraentes para espectroscopia molecula
APA, Harvard, Vancouver, ISO, and other styles
14

Wyatt, Adam Stacey. "Spectral interferometry for the complete characterisation of near infrared femtosecond and extreme ultraviolet attosecond pulses." Thesis, University of Oxford, 2007. http://ora.ox.ac.uk/objects/uuid:22b7750a-6328-42c1-a7f6-965523858c05.

Full text
Abstract:
This thesis describes methods for using spectral interferometry for the complete space-time characterisation of few-cycle near-infrared femtosecond pulses and extreme ultraviolet (XUV) attosecond pulses produced via high harmonic generation (HHG). Few-cycle pulses tend to exhibit one or more of the following: (1) an octave-spanning bandwidth, (2) a highly modulated spectrum and (3) space-time coupling. These characteristics, coupled with the desire to measure them in a single-shot (to characterise shot-to-shot fluctuations) and in real-time (for online optimisation and control) causes problems
APA, Harvard, Vancouver, ISO, and other styles
15

Krishnan, Siva Rama [Verfasser], and Joachim [Akademischer Betreuer] Ullrich. "Doped Helium Nanodroplets in Intense Few-cycle Infrared Pulses / Siva Rama Krishnan ; Betreuer: Joachim Ullrich." Heidelberg : Universitätsbibliothek Heidelberg, 2011. http://d-nb.info/1179783077/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
16

Chanal, Margaux. "Space-time study of energy deposition with intense infrared laser pulses for controlled modification inside silicon." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0488/document.

Full text
Abstract:
La modification du silicium dans son volume est possible aujourd’hui avec des lasers infrarouges nanosecondes. Néanmoins, le régime d’intérêt pour la modification contrôlée en volume des matériaux transparents correspond aux impulsions femtosecondes. Cependant, aujourd’hui aucune démonstration de modification permanente du volume du Si n’a été réalisée avec une impulsion ultra-brève (100 fs). Pour infirmer ce résultat, nous avons développé des méthodes de microscopie infrarouge ultra-rapides. Tout d’abord, nous étudions le microplasma confiné dans le volume, caractérisé par la génération de po
APA, Harvard, Vancouver, ISO, and other styles
17

Jargot, Gaëtan. "High-repetition rate CEP-stable few-cycle OPCPA sources in the short wavelength infrared/mid-infrared." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLO020.

Full text
Abstract:
Résumé : La génération d’impulsions de quelques cycles optiques stabilisées en CEP dans le moyen infrarouge utilisant la technique d’amplification paramétrique optique à fort taux de répétition est d’un grand intérêt pour diverses études de dynamiques ultra-brèves. Les travaux de cette thèse sont directement inscrits dans ce cadre. Nous décrivons un système émettant des impulsions dont le spectre est centré à 2.1 µm avec une durée de 19.5 fs et une énergie de 31 µJ opérant à 10 kHz avec une stabilité RMS de 0.54 %. Ce système se distingue de l’état de l’art par la mise en œuvre d’une technique
APA, Harvard, Vancouver, ISO, and other styles
18

Reynolds, Pamela. "Investigation of cellular DNA damage induced by multiphoton laser light absorption of near infrared femtosecond laser pulses." Thesis, University of Reading, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515710.

Full text
APA, Harvard, Vancouver, ISO, and other styles
19

Bezant, Christopher David. "Application of THz pulses in semiconductor relaxation and biomedical imaging studies." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325712.

Full text
APA, Harvard, Vancouver, ISO, and other styles
20

Wheeler, Jonathan Allen. "The Scaling of High Harmonics with Mid-Infrared Driving Fields and a Method for the Spatial Isolation of Individual Subfemtosecond Pulses." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1339165013.

Full text
APA, Harvard, Vancouver, ISO, and other styles
21

Лєпіхов, Олександр Іванович, Александр Иванович Лепихов, Oleksandr Ivanovuch Liepikhov та О. Василенко. "Устройство измерения параметров инфракрасных импульсов". Thesis, Издательство СумГУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/21103.

Full text
APA, Harvard, Vancouver, ISO, and other styles
22

Gorkhover, Taisia [Verfasser], Thomas [Akademischer Betreuer] Moeller, and Thomas [Akademischer Betreuer] Fennel. "Ultrafast light induced dynamics of Xe nanoparticles studied with a combination of intense infrared and x-ray pulses / Taisia Gorkhover. Gutachter: Thomas Fennel. Betreuer: Thomas Moeller." Berlin : Technische Universität Berlin, 2014. http://d-nb.info/1066161402/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
23

Fusari, Flavio. "Continuous wave and modelocked femtosecond novel bulk glass lasers operating around 2000 nm." Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/1694.

Full text
Abstract:
This thesis reports on the development of glass-based femtosecond laser sources around 2 µm wavelength. In order to be able to produce 2 µm radiation the dopants used were trivalent Thulium (Tm³⁺) and trivalent Holmium (Ho³⁺) that could be optically pumped with Ti:Sapphire radiation at 0.8 µm and semiconductor disk lasers (SDL) at 1.2 µm. The samples were produced at Leeds University and polished in-house in bulk form and deployed in free space laser cavities. Tellurite compounds doped with Tm³⁺ produced stable continuous wave 1.94 µm radiation when pumped at 800 nm with a maximum efficiency o
APA, Harvard, Vancouver, ISO, and other styles
24

Mendonça, Marcela de Freitas. "Projeto e construção de um amplificador paramétrico óptico operando no infravermelho médio." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-14062010-162036/.

Full text
Abstract:
Um Amplificador Paramétrico Óptico (optical parametric amplifier - OPA) é uma fonte de luz coerente, de alta qualidade e sintonizável, baseada em processos ópticos não-lineares de segunda ordem. Alguns modelos possuem largura de banda estreita e um amplo intervalo de sintonia, podendo alcançar regiões que vão desde o ultravioleta até o infravermelho médio. A nossa motivação para construir este amplificador paramétrico óptico é sua utilização em experimentos de espectroscopia vibracional de superfícies através do processo óptico não-linear de segunda ordem, geração de soma de frequências (sum-f
APA, Harvard, Vancouver, ISO, and other styles
25

Lamour, Tobias Paul. "High pulse energy near-infrared ultrafast optical parametric oscillators." Thesis, Heriot-Watt University, 2011. http://hdl.handle.net/10399/2509.

Full text
Abstract:
A source-demand in the near- and mid-IR wavelength spectrum exists for various applications such as waveguide inscription, multiphoton imaging, and nonlinear spectroscopy. All of the applications seek for higher repetitions rates for faster processing speed, better signal to noise ratios or to improve the results for applications like laser waveguide inscription. This is in contrast to the high pulse energies, required to drive the nonlinear processes involved with these applications. Available systems are either based on low-energy, high-repetition-rate optical parametric oscillators or high-
APA, Harvard, Vancouver, ISO, and other styles
26

Hayes, Andrew Robert. "Digital pulse interval modulation for indoor optical wireless communication systems." Thesis, Sheffield Hallam University, 2002. http://shura.shu.ac.uk/7263/.

Full text
Abstract:
Over the past decade, infrared has attracted a considerable amount of interest as an alternative medium to radio for short-range indoor wireless local area networks. Infrared offers a number of significant advantages over its radio frequency counterpart, such as the abundance of bandwidth that is currently unregulated worldwide, the availability of low cost emitters and detectors, inherent security and resistance to multi path fading. The work presented in this thesis focuses on modulation techniques, the fundamental aim being to assess the suitability of digital pulse interval modulation (DPI
APA, Harvard, Vancouver, ISO, and other styles
27

Torres-Pagán, Ricardo Daniel. "Matrix-assisted resonant infrared pulsed laser ablation of electroluminescent dendrimers." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024390.

Full text
APA, Harvard, Vancouver, ISO, and other styles
28

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
29

Nikzad, Lida. "Femtosecond-resolved semiconductor dynamics with mid- and far-infrared pulsed lasers." Thesis, University of Surrey, 2007. http://epubs.surrey.ac.uk/843729/.

Full text
Abstract:
In this thesis mid-infrared time-resolved pump-probe measurements are presented to evaluate spin dynamics in narrow gap semiconductors. The polarization of the pump beam is modulated and the transmittance change in the probe beam is measured. The optical polarization is measured versus time delay and its decay yields the spin lifetime. Results show that the spin lifetime decreases with increasing temperature. Between InAs and Insb films, although InAs shows longer spin lifetime, it has an accumulation layer in the surface with high current and very short spin lifetime, while InSb has a surface
APA, Harvard, Vancouver, ISO, and other styles
30

Hodgson, Peter. "The detection of oil in water by near infrared pulsed photoacousticspectroscopy." Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1402.

Full text
Abstract:
An experimentally based study to investigate near infrared laser photoacoustic spectroscopy as a technique to measure oil pollution is described. Photoacoustic spectroscopy is shown to be well suited to the application of monitoring oil in water in a pipeline. The role of the physical parameters important to photoacoustic generation is shown to lead to an effective amplification of differences in the optical absorption coefficients for many hydrocarbons and alcohols in water. This amplification is typically an order of magnitude and persists at low concentrations of arialyte, such that a Nd:YA
APA, Harvard, Vancouver, ISO, and other styles
31

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.

Full text
Abstract:
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'ion
APA, Harvard, Vancouver, ISO, and other styles
32

Rachimov, Rustam Ch, Vladimir P. Ermakov, Peter John, and Murod R. Rachimov. "Anwendung funktioneller Keramiken für Technologien des Trocknens mit Impuls-Infrarot." Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2014. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-151116.

Full text
Abstract:
Das Trocknen von feuchten Gütern mit Impuls-Infrarot auf Basis funktioneller Keramiken (IR.C) ist eine neue und hocheffektive Technologie, die von den Autoren entwickelt wurde. Im Unterschied zum klassischen marktüblichen Infrarot dringt IR.C dank seiner Eigenschaften mit Lichtgeschwindigkeit tief und schonend in das Gut ein und regt dort von innen heraus das Wasser zum Verdunsten an. Die Eindringtiefe kann sowohl mit unterschiedlichen Keramiken als auch mit unterschiedlicher Impulsstärke eingestellt werden. Es wird an einer großen Zahl verschiedener Trocknungsgüter, angefangen von sensiblen
APA, Harvard, Vancouver, ISO, and other styles
33

Olupitan, Samuel. "Efficient pulse compression at near-infrared region using photonic crystal fibres." Thesis, University of Aberdeen, 2011. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=202703.

Full text
APA, Harvard, Vancouver, ISO, and other styles
34

Naz, Naveed A. "Investigation into mid-infrared pulse shaping using an optical parametric oscillator." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/54050/.

Full text
Abstract:
This thesis reports experimental indirect spectral transfer of shaped pulses from the near to mid-infrared via the use of an optical parametric oscillator. It was shown that good spectral fidelity of transfer can be achieved by making suitable adjustments to the OPO. The issues affecting the transfer process are discussed and experimental results are compared with existing theory. The shaping of the nearinfrared pulses was performed using a zero dispersion pulse shaper and a computer controlled spatial light modulator. A suitable search algorithm was written and, with the use of appropriate co
APA, Harvard, Vancouver, ISO, and other styles
35

Kurti, R. Steven Jr. "Pulse Compression in a Mid-infrared Synchronously Pumped Optical Parametric Oscillator." Case Western Reserve University School of Graduate Studies / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=case1106235646.

Full text
APA, Harvard, Vancouver, ISO, and other styles
36

Kneis, Christian. "Investigation of mid-infrared supercontinuum generation in soft-glass fibers from a Q-switched mode-locked 2 mm fiber laser." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0135/document.

Full text
Abstract:
Cette thèse est dédiée à l’étude de la génération de supercontinuum (SCG) deforte puissance moyenne dans le domaine spectral entre 2 mm et 5,5 mm. Un laser à fibredopée thulium (Tm3+) opérant dans un régime simultanément déclenché et à verrouillage demodes (QML) a été développé. En régime continu ce laser a délivré 70 W et en régime QML,26Wmoyens ont été obtenus pour des taux de répétition en QS de 180 kHz ou plus. L’énergiela plus élevée contenue dans une enveloppe QS a été évaluée à 166 mJ avec 66 mJ contenuedans la sous-impulsion à verrouillage de mode la plus énergétique. L’émission du las
APA, Harvard, Vancouver, ISO, and other styles
37

Hung, Hazel S. S. "An adaptive mid-infrared ultrashort pulse source for applications in coherent control." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/340806/.

Full text
Abstract:
An adaptive mid-infrared (MIR) ultrashort pulse source is investigated for application to the coherent control of molecules. The MIR regime will allow access to vibrational modes of common organic bonds, and ultrashort pulse durations should enable the required interaction to occur before the energy is redistributed throughout the molecule. By using the molecular system as part of an adaptive learning loop, one can deliver the desired MIR pulse without the need for prior lengthy calculations to solve the Hamiltonian. The adaptive MIR pulse shaper is presented as a feasibility study in this the
APA, Harvard, Vancouver, ISO, and other styles
38

Seiter, Michael. "Novel pulsed difference-frequency laser sources for compact mid-infrared trace-gas sensors /." Zürich, 1999. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13354.

Full text
APA, Harvard, Vancouver, ISO, and other styles
39

Heiderscheit, Timothy Donald. "Comparative study of near-infrared pulsed laser machining of carbon fiber reinforced plastics." Thesis, University of Iowa, 2017. https://ir.uiowa.edu/etd/5946.

Full text
Abstract:
Carbon fiber-reinforced plastics (CFRPs) have gained widespread popularity as a lightweight, high-strength alternative to traditional materials. The unique anisotropic properties of CFRP make processing difficult, especially using conventional methods. This study investigates laser cutting by ablation as an alternative by comparing two near-infrared laser systems to a typical mechanical machining process. This research has potential applications in the automotive and aerospace industries, where CFRPs are particularly desirable for weight savings and fuel efficiency. First, a CNC mill was used
APA, Harvard, Vancouver, ISO, and other styles
40

Reid, Derryck T. "Novel nonlinear techniques for femtosecond pulse generation in the visible and near-infrared." Thesis, University of St Andrews, 1995. http://hdl.handle.net/10023/14885.

Full text
Abstract:
The work presented in this thesis describes the design, configuration and operation of femtosecond optical parametric oscillators based on the materials KTiOPO4 (KTP) and RbTiOAsO4 (RTA) and pumped by a self- modelocked Ti:sapphire laser. The alignment of the pump laser is detailed and thermal effects in the Ti:sapphire rod are examined in the context of a general technique which optimises modelocked performance at any pump power. A KTP-based femtosecond parametric oscillator is described which produces 400-fs-duration signal pulses at an average output power of 150 mW when operated in the abs
APA, Harvard, Vancouver, ISO, and other styles
41

Pierce, James. "Defect Detection in Additive Manufacturing Utilizing Long Pulse Thermography." Scholar Commons, 2018. http://scholarcommons.usf.edu/etd/7219.

Full text
Abstract:
Additive Manufacturing (AM), over the years, has seen a tremendous amount of research for improving the manufacturability of materials into final products. The main advantages of additive manufacturing are the minimizing of waste material as it is an additive process. As well as the ability to create custom low-volume products without the need for creation of expensive tooling or programming before manufacturing begins. Because of these advantages, however, AM is susceptible to unique challenges in the quality side of manufacturing. These challenges include minimizing and detecting defects dur
APA, Harvard, Vancouver, ISO, and other styles
42

Garet, Frédéric. "Génération optoélectronique d'impulsions électromagnétiques ultra-courtes : application à la spectroscopie THz." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0175.

Full text
Abstract:
Nous presentons la construction et l'utilisation d'une experience de spectroscopie terahertz pour la caracterisation de materiaux dans le domaine sub-millimetrique, les mesures etant realisees dans le domaine temporel. Dans une premiere partie, nous decrivons tout d'abord l'experience dediee a la generation et a la mesure d'impulsions electromagnetiques (em) ultracourtes. Nous employons des photocommutateurs sur substrat de lt-gaas excites par une impulsion laser de 100 fs de duree, et utilises comme dipole de hertz. Nous obtenons ainsi des impulsions em de durees voisines de la picoseconde et
APA, Harvard, Vancouver, ISO, and other styles
43

Weerasekara, Aruna Bandara. "Electrical and Optical Characterization of Group III-V Heterostructures with Emphasis on Terahertz Devices." Digital Archive @ GSU, 2007. http://digitalarchive.gsu.edu/phy_astr_diss/16.

Full text
Abstract:
Electrical and optical characterizations of heterostructures and thin films based on group III-V compound semiconductors are presented. Optical properties of GaMnN thin films grown by Metalorganic Chemical Vapor Deposition (MOCVD) on GaN/Sapphire templates were investigated using IR reflection spectroscopy. Experimental reflection spectra were fitted using a non - linear fitting algorithm, and the high frequency dielectric constant (ε∞), optical phonon frequencies of E1(TO) and E1(LO), and their oscillator strengths (S) and broadening constants (Γ) were obtained for GaMnN thin films with different Mn
APA, Harvard, Vancouver, ISO, and other styles
44

Müller, Niklas [Verfasser], and Annemarie [Akademischer Betreuer] Pucci. "Multimodal microscopy in mid-infrared via flexible pulse shaping / Niklas Müller ; Betreuer: Annemarie Pucci." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/1217328203/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
45

Dada, Oluwatosin Olubunmi. "Pulse-Laser Infrared Photothermal Spectrometry of Condensed-Phase Aerosols Based on Photothermal Deflection Spectroscopy." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/52.

Full text
Abstract:
The research reported in this dissertation is aimed at development of photothermal deflection detector that is consistent with constraints imposed by aerosols sampling and analysis. The main objectives of this project are: 1) the design and evaluation of initial apparatus prototypes and 2) a test of the prototype apparatus with surrogate substances using conventional mid-infrared gas lasers. Experimental evaluation of reduced size photothermal apparatus is first performed with gaseous samples. Analysis of trichlorofluoromethane (CFC-11) and ethanol vapors is performed with both conventional l
APA, Harvard, Vancouver, ISO, and other styles
46

Chen, Bo-Han [Verfasser], and Ferenc [Akademischer Betreuer] Krausz. "Single-cycle mid-infrared pulse generation via nonlinear optics / Bo-Han Chen ; Betreuer: Ferenc Krausz." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1203067496/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
47

Bain, Fiona Mair. "Yb:tungstate waveguide lasers." Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/1698.

Full text
Abstract:
Lasers find a wide range of applications in many areas including photo-biology, photo-chemistry, materials processing, imaging and telecommunications. However, the practical use of such sources is often limited by the bulky nature of existing systems. By fabricating channel waveguides in solid-state laser-gain materials more compact laser systems can be designed and fabricated, providing user-friendly sources. Other advantages inherent in the use of waveguide gain media include the maintenance of high intensities over extended interaction lengths, reducing laser thresholds. This thesis present
APA, Harvard, Vancouver, ISO, and other styles
48

Chirla, Razvan Cristian. "Attosecond Pulse Generation and Characterization." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313429461.

Full text
APA, Harvard, Vancouver, ISO, and other styles
49

Ye, Hanyu. "Novel pulsed optical parametric sources in the mid-infrared and the application towards high-resolution molecular spectroscopy." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/666960.

Full text
Abstract:
The mid-infrared (mid-IR) spectral region coincides with fundamental rotational-vibrational transitions of a large number of molecules in the gas phase. The strong interaction between mid-IR light sources and these gaseous molecules has enabled experimental investigations of energy-level structures of various molecules and also led to a series of spectroscopic applications in, for example, biomedicine, environmental monitoring, and combustion diagnostics. Nanosecond pulsed optical parametric sources tunable in the mid-IR are versatile tools offering the potential to access different molecular
APA, Harvard, Vancouver, ISO, and other styles
50

Rhoades, Matthew W. "Pulsed Laser Deposition and Electrical Properties of Zinc Selenide Based Thin Film Structures for Integration with Mid-infrared Applications." Thesis, The University of Alabama at Birmingham, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10787536.

Full text
Abstract:
<p> Thin films of chlorine (Cl) and copper (Cu) doped zinc selenide (Cl:ZnSe and Cu:ZnSe) were fabricated by pulsed laser deposition (PLD) with the goal of enabling a multilayered semiconductor structure for a mid-infrared (mid-IR) electrically excited laser. Doping of ZnSe is achieved by varying the mass ratio of zinc chloride (ZnCl<sub>2</sub>) or copper selenide (Cu<sub>2</sub>Se) to ZnSe precursors in starting pressed powder targets. Appropriate adjustment of the fraction of dopant precursor in the mixtures allows for the control of the dopant concentration, N<i><sub>D</sub></i>&ndash;N<i>
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the bibliographies on the topic 'Infrared pulses' for other source types:
Journal articles Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography