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Dissertations / Theses on the topic 'Chirped pulse laser ablation'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Grubbs, Garry Smith II. "Investigating Molecular Structures: Rapidly Examining Molecular Fingerprints Through Fast Passage Broadband Fourier Transform Microwave Spectroscopy." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc67988/.

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Microwave spectroscopy is a gas phase technique typically geared toward measuring the rotational transitions of Molecules. The information contained in this type of spectroscopy pertains to a molecules structure, both geometric and electronic, which give insight into a molecule's chemistry. Typically this type of spectroscopy is high resolution, but narrowband ≤1 MHz in frequency. This is achieved by tuning a cavity, exciting a molecule with electromagnetic radiation in the microwave region, turning the electromagnetic radiation o, and measuring a signal from the molecular relaxation in the fo

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2

Nguyen, Dat. "Dynamic feedback pulse shaping for high power chirped pulse amplification system." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5826.

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The topic of this proposal is the development of high peak power laser sources with a focus on linearly chirped pulse laser sources. In the past decade chirped optical pulses have found a plethora of applications such as photonic analog-to-digital conversion, optical coherence tomography, laser ranging, etc. This dissertation analyzes the aforementioned applications of linearly chirped pulses and their technical requirements, as well as the performance of previously demonstrated parabolic pulse shaping approaches. The experimental research addresses the topic of parabolic pulse generation in

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3

Mason, Michael Brett. "A sub-50 fs titanium-sapphire chirped pulse amplification laser system." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326264.

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4

Moon, Eric Wayne. "Carrier-envelope phase stabilization of grating-based chirped-pulse amplifiers." Diss., Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1125.

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5

Lam, Matthew Hon C. "Chirped-pulse laser amplifier and passive enhancement cavity for generation of extreme ultraviolet light." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/27803.

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Extreme ultraviolet (EUV) light has many potential applications, including spectroscopy and scattering experiments in physical chemistry and atmospheric science. The dominant method for producing high-flux coherent radiation in this spectral range is synchrotron radiation produced from highly subscribed national-scale facilities such as the Canadian Light Source. An alternative to synchrotron radiation is high harmonic generation (HHG), a nonlinear optical process requiring high optical intensities. This thesis describes the development of an optical amplifier and passive enhancement cavity

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6

Kim, Kyungbum. "ALL-SEMICONDUCTOR HIGH POWER MODE-LOCKED LASER SYSTEM." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2482.

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The objective of this dissertation is to generate high power ultrashort optical pulses from an all-semiconductor mode-locked laser system. The limitations of semiconductor optical amplifier in high energy, ultrashort pulse amplification are reviewed. A method to overcome the fundamental limit of small stored energy inside semiconductor optical amplifier called "eXtreme Chirped Pulse Amplification (X-CPA)" is proposed and studied theoretically and experimentally. The key benefits of the concept of X-CPA are addressed. Based on theoretical and experimental study, an all-semiconductor mode-locked

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7

Driever, Steffen. "Development of an ytterbium fibre based chirped pulse amplification laser system for high harmonic generation." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/26273.

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In this thesis, I describe the development of a high repetition rate femtosecond fibre based chirped pulse amplification system (FCPA) for strong-field physics experiments. This project was set in a newly established sub-group of the Laser Consortium at Imperial College London with the aim to push the strong-field and attosecond science experiments to be conducted at 100s of kHz repetition rate. It was important to design and implement a compact, CEP stable, high repetition rate fibre CPA system. Custom optics and mounts were employed in order to achieve a compact stretcher and compressor desi

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8

Pathak, Kedar A. "Computational Modeling of Plume Dynamics in Multiple Pulse Laser Ablation of Carbon." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1216317908.

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9

Yilmaz, Remziye Pinar. "Timing Issues In A Terawatt Laser System." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12610017/index.pdf.

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In the laser market, there have been various kinds of lasers designed and utilized for different purposes. As time goes on, their powers have been gradually increased from kilowatts (kW) to terawatts (TW). One of the most famous methods in laser science technology is Chirped Pulse Amplification (CPA) which enables table-top terawatt laser systems. This method provides high output power (tens of TW), very short pulse duration (few tens of femtoseconds) and large energy (mJ) for ultrafast lasers. One of the most well-known ultrafast lasers is Titanium:Sapphire laser. This thesis work concentrate

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10

Stoian, Razvan. "Adaptive techniques for ultrafast laser material processing." Habilitation à diriger des recherches, Université Jean Monnet - Saint-Etienne, 2008. http://tel.archives-ouvertes.fr/tel-00352662.

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Le besoin d'une très grande précision lors du traitement des matériaux par laser a fortement encouragé le développement des études de l'effet des impulsions ultra brèves pour la structuration des matériaux à une échelle micro et nano métrique. Une diffusion d'énergie minimale et une forte non linéarité de l'interaction permet un important confinement énergétique à des échelles les plus petites possibles. La possibilité d'introduire des changements de phases rapides et même de créer de nouveaux états de matière ayant des propriétés optimisées et des fonctions améliorées donne aux impulsions ult

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11

Löser, Markus. "Diode-Pumped High-Energy Laser Amplifiers for Ultrashort Laser Pulses The PENELOPE Laser System." Doctoral thesis, Helmholtz-Zentrum Dresden - Rossendorf, 2017. https://tud.qucosa.de/id/qucosa%3A30755.

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The ultrashort chirped pulse amplification (CPA) laser technology opens the path to high intensities of 10^21 W/cm² and above in the laser focus. Such intensities allow laser-matter interaction in the relativistic intensity regime. Direct diode-pumped ultrashort solid-state lasers combine high-energy, high-power and efficient amplification together, which are the main advantages compared to flashlamp-pumped high-energy laser systems based on titanium-doped sapphire. Development within recent years in the field of laser diodes makes them more and more attractive in terms of total costs, compact

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12

Löser, Markus. "Diode-Pumped High-Energy Laser Amplifiers for Ultrashort Laser Pulses The PENELOPE Laser System." Helmholtz-Zentrum Dresden - Rossendorf, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-232322.

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The ultrashort chirped pulse amplification (CPA) laser technology opens the path to high intensities of 10^21 W/cm² and above in the laser focus. Such intensities allow laser-matter interaction in the relativistic intensity regime. Direct diode-pumped ultrashort solid-state lasers combine high-energy, high-power and efficient amplification together, which are the main advantages compared to flashlamp-pumped high-energy laser systems based on titanium-doped sapphire. Development within recent years in the field of laser diodes makes them more and more attractive in terms of total costs, compact

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13

Troha, Anthony Lawrence. "The theory and design of a chirped-pulse inverse free-electron laser : an innovative, compact, high-energy, vacuum-based, electron accelerator /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.

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14

Mentzer, Robert. "A one dimensional numeric model of the chirped pulse amplification of broadband laser light by an amplifier with broadband gain spectrum." Thesis, Southern Illinois University at Edwardsville, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1552541.

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<p> We have developed a one dimensional numeric simulation of the amplification of broadband laser light in a chirped pulse amplification (CPA) system containing an amplifier with a broadband gain spectrum. We present the theory concerning the generation of laser pulses and pulse shape altering effects. We model the amplification of monochromatic light in a narrow bandwidth amplifier as demonstrated by Lee M. Frantz and John S. Nodvik in their 1963 paper. Using the CPA method, we expand this model to describe the amplification of broadband laser pulses by an amplifier with a broadband gai

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15

Lantigua, Christopher. "Metrology of Volume Chirped Bragg Gratings Recorded in Photo-Thermo-Refractive Glass for Ultrashort Pulse Stretching and Compressing." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5803.

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Chirped Bragg gratings (CBGs) recorded in photo-thermo-refractive (PTR) glass provide a very efficient and robust way to stretch and compress ultra-short laser pulses. These gratings offer the ability to stretch pulses from hundreds of femtoseconds, to the order of 1 ns and then re-compress them. However, in order to achieve pulse stretching of this magnitude, 100 mm thick CBGs are needed. Using these CBGs to both stretch, and re-compress the pulse thus requires propagation through 200 mm of optical glass. This therefore demands perfect control of the glass homogeneity, as well as the holograp

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16

Pasquier, Corinne. "Ablation d'une cible solide diélectrique par une impulsion laser ultrabrève dans l'air." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0232/document.

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Les impulsions laser de quelques cycles optiques offrent des capacités remarquables dans l’interaction laser-matière, en particulier pour l’ablation de matériaux diélectriques. Cependant, la focalisation d’impulsions laser ultracourtes dans l’air implique des limitations naturelles à la propagation linéaire du faisceau en amont de la cible. Dans ce contexte, on étudie l’ablation en surface de matériaux diélectriques lorsqu’ils sont irradiés par une impulsion unique de 12 fs dans l’air, dans des gammes d’intensités situées au-dessous et au-dessus de l’apparition des effets non linéaires dans l’

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17

Loeser, Markus. "Diode-Pumped High-Energy Laser Amplifiers for Ultrashort Laser Pulses." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-232571.

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The ultrashort chirped pulse amplification (CPA) laser technology opens the path to high intensities of 10^21 W/cm² and above in the laser focus. Such intensities allow laser-matter interaction in the relativistic intensity regime. Direct diode-pumped ultrashort solid-state lasers combine high-energy, high-power and efficient amplification together, which are the main advantages compared to flashlamp-pumped high-energy laser systems based on titanium-doped sapphire. Development within recent years in the field of laser diodes makes them more and more attractive in terms of total costs, compact

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18

MACHADO, LEANDRO M. "Microusinagem de dielétricos com pulsos laser de femtossegundos." reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10119.

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Made available in DSpace on 2014-10-09T12:34:59Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:04:28Z (GMT). No. of bitstreams: 0<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP<br>FAPESP:08/00284-0

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19

Voronov, Sergei Leonidovich. "Controlling Laser High-Order Harmonic Generation Using Weak Counter-Propagating Light." BYU ScholarsArchive, 2002. https://scholarsarchive.byu.edu/etd/49.

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Laser high-order harmonic generation in the presence of relatively weak interfering light is investigated. The interfering pulses intersect the primary harmonic-generating laser pulse at the laser focus. The interfering light creates a standing intensity and phase modulation on the field, which disrupts microscopic phase matching and shuts down local high harmonic production. Suppression of the 23rd harmonic (by two orders of magnitude) is observed when a counter-propagating interfering pulse of light is introduced. A sequence of counter-propagating pulses can be used to shut down harmonic pro

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20

Brikas, Marijus. "Microprocessing of silicon and metals with high pulse repetition rate picosecond lasers." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110324_161348-78636.

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The objective of the thesis is to investigate applicability of high pulse repetition rate picosecond lasers for microfabrication and to clarify high repetition rate pulse interaction with metals and silicon. The ablation threshold and accumulation rate dependence on the laser pulse duration for silicon and metals has been experimentally studied. The model of optimal focus conditions for the maximum ablation rate was developed and experimentally confirmed. The material evaporation rate decreases duo to plasma screening for high pulse energies. Various pulse length lasers have been used for cutt

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21

Cohen, Jacob Arthur. "Measuring the electric field of picosecond to nanosecond pulses with high spectral resolution and high temporal resolution." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37179.

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We demonstrate four experimentally simple methods for measuring very complex ultrashort light pulses. Although each method is comprised of only a few optical elements, they permit the measurement of extremely complex pulses with time-bandwidth products greater than 65,000. First, we demonstrate an extremely simple frequency-resolved-optical gating (GRENOUILLE) device for measuring the intensity and phase of pulses up to ~20ps in length. In order to achieve the required high spectral resolution and large temporal range, it uses a few-cm-thick second harmonic-generation crystal in the shape of a

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22

DOAN, TRONG-DUC. "Recherche de structures supraconductrices a faible piegeage de vortex. Synthese et proprietes d'heterostructures et de superreseaux obtenus par ablation laser pulse." Caen, 1999. http://www.theses.fr/1999CAEN2051.

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Des heterostructures et des superreseaux de films minces d'oxydes de cuivre ont ete realises par ablation laser pulse classique. Dans la premiere partie de ce travail, le piegeage des vortex a ete etudie dans les films bicouches : la 4bacu 5o 1 3 + / yba 2cu 3o 7 afin de determiner la structure avec le plus faible piegeage pour la realisation d'un transistor a flux de vortex. Le piegeage a ete caracterise par les energies d'activation extraites a partir de mesures de resistivite sous champ magnetique. L'etude a permis de determiner que la structure la moins piegeante etait le film : la 4bacu 5

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23

Ramirez, Lourdes Patricia. "Few-cycle OPCPA laser chain." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00806245.

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The Apollon-10 PW laser chain is a large-scale project aimed at delivering 10 PW pulses to reach intensities of 10^22 W/cm^2. State of the art, high intensity lasers based solely on chirped pulse amplification (CPA) and titanium sapphire (Ti:Sa) crystals are limited to peak powers reaching 1.3 PW with 30-fs pulses as a result of gain narrowing in the amplifiers. To access the multipetawatt regime, gain narrowing can be suppressed with an alternative amplification technique called optical parametric chirped pulse amplification (OPCPA), offering a broader gain bandwidth and pulse durations as sh

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24

Bourquard, Florent. "Ablation laser femtoseconde assistée d’une mise en forme temporelle pour le dépôt de couches minces et la synthèse de nanoparticules." Thesis, Saint-Etienne, 2013. http://www.theses.fr/2013STET4022/document.

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Ce travail explore le contrôle de la composition et la cinétique du panache d’ablation laser en régime ultrabref par mise en forme temporelle des impulsions laser femtoseconde. L’objectif est l’optimisation du dépôt de couches minces et de nanoparticules. Le chapitre 1 est une synthèse de la littérature sur le dépôt de couches minces par ablation laser femtoseconde, en particulier de films de Diamond-Like Carbon et de nanoparticules. L’influence de la mise en forme temporelle du laser sur les mécanismes d’ablation est développée, ainsi que le diagnostic du panache d’ablation. Le chapitre 2 pré

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25

Sims, Robert. "Development of Thulium Fiber Lasers for High Average Power and High Peak Power Operation." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5706.

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High power thulium fiber lasers are useful for a number of applications in both continuous-wave and pulsed operating regimes. The use of thulium as a dopant has recently gained interest due to its large bandwidth, possibility of high efficiency, possibility of high power and long wavelength ~1.8 – 2.1 [micro]m. The longer emission wavelength of Tm-doped fiber lasers compared to Yb- and/or Er-doped fiber lasers creates the possibility for higher peak power operation due to the larger nonlinear thresholds and reduced nonlinear phase accumulation. One primary interest in Tm-doped fiber lasers

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26

Kane, Kenneth. "Metallic systems at the nano and micro scale: Bimetallic nanoparticles as catalysts and MCrAlY bond coats in thermal barrier coatings." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/5732.

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The dissertation is split into two parts. The first part will be focused on changes in material properties found at the nanoscale, as miscibility and electronic structure can change significantly with size. The formation of classically-immiscible bimetallic nanoparticles (BNPs) becomes favorable at the nanoscale and novel catalytic properties can emerge from the bimetallic alloying. The formation of alloyed and non-alloyed BNPs is achieved through pulse laser ablation (PLA) and a significant increase in catalytic activity is observed for both. Recently discovered, the increased activity in the

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27

Dacasa, Pereira Hugo. "Spatial and temporal metrology of coherent ultrashort pulses inthe extreme-ultraviolet domain." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX041/document.

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Les impulsions ultra-brèves de rayonnement ultraviolet extrême (UVX) ont un grand champ d’application dans les domaines tels que le diagnostic de plasmas, la spectroscopie ou l’étude de la dynamique ultrarapide dans les atomes et les molécules.Aujourd’hui, il existe trois sources délivrant ce genre d’impulsions. Les harmoniques d’ordre élevé (HHG, en anglais) générés dans les gaz rares ou sur les solides peuvent fournir des impulsions attosecondes. Cependant, leur énergie, le plus souvent de l’ordre du nanojoule, limite les applications. L’amplification des impulsions harmoniques dans les plas

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28

Diaz, Javier. "Study of amorphous carbon thin films grown by pulsed laser deposition." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10015.

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Le but de cette these est l'etude des parametres physiques qui font varier les proprietes electroniques et mecaniques des couches minces de carbone amorphe (a-c) evaporees par la technique de deposition par laser pulse (pld). Tout d'abord, on a fait des experiences pour connaitre le systeme experimental: on a etudie la composition du materiau evapore et la cinetique de deposition des particules sur la surface de si (111) 7x7. Cette derniere a ete observe a l'echelle atomique avec un microscope a effet tunnel dans l'ultra vide. Dans une deuxieme partie, on a caracterise les depots de a-c. Ces f

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29

Labaye, François. "Amplification passive d'un laser à fibre optique dans une cavité Fabry-Perot : application à la production de rayonnement gamma par diffusion Compton inverse." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00837822.

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La nécessité de prouver l'existence de nouvelles particules comme les quarks et le boson de Higgs a entrainé le développement de deux nouveaux pans de la recherche : la physique des hautes énergies ou physique des particules, dédiée à prouver expérimentalement l'existence de ces particules puis à étudier leurs propriétés et la physique des accélérateurs, dédiée au développement de nouveaux instruments pour la physique des hautes énergies.Dans ce contexte, des collisionneurs linéaires électrons/positrons polarisés de forte luminosité dont l'énergie serait connue et accordable pourrait permettre

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30

Delagnes, Jean-Christophe. "Contrôle de la propagation d'impulsions ultracourtes : effets de déplacements lumineux." Toulouse 3, 2005. http://www.theses.fr/2005TOU30227.

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Cette thèse présente l'étude théorique et expérimentale du contrôle des phénomènes de propagation cohérente d'impulsions ultracourtes dans un milieu résonant optiquement dense. Dans une première partie, nous décrivons les phénomènes élémentaires des effets de propagation. Dans un second temps, nous développons l'idée de contrôler par un champ fort, les propriétés transitoires d'une autre impulsion faible et résonante qui se propage simultanément dans le milieu. Le champ fort induit des modifications transitoires dans le milieu, qui modifient par rayonnement le champ de l'impulsion résonante qu

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31

Rothman, Johan. "Etude des propriétés structurales, électroniques et magnétiques des couches minces épitaxiées de cerium." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10019.

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Les proprietes structurales, electroniques et magnetiques de couches minces epitaxiees de cerium ont ete etudiees avec l'objectif de mieux connaitre l'element ce lui meme, ainsi que d'effectuer une premiere etude d'un systeme de basse dimensionnalite presentant des proprietes de type reseau kondo. Les couches ont ete preparees sous ultra-vide par depot laser pulse sur une couche tampon de w(110) ou de wnb(110), elle meme initialement epitaxiee sur un substrat d'al#2o#3(1120). Une nouvelle methode originale de croissance des couches tampon a ete developpee, qui permet une croissance parfaitemen

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32

Tchiffo, Tameko Cyril. "Croissance et propriétés de couches minces d’oxydes pour microsources d’énergie." Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2068/document.

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Cette thèse concerne la réalisation des films minces d’oxydes et l’étude de leurs propriétés physiques pour les cellules photovoltaïques (PV) et les modules thermoélectriques. Dans une première partie, les propriétés de l’oxyde de titane TiOx (1,45<br>This thesis concerns the realization of oxide thin films and the study of their properties for photovoltaic or thermoelectric devices. In the first part, the TiOx properties are studied for use as an optically active transparent conductive oxide to put in front of the PV cells or, as optical coupling layer to interpose between the metal reflector

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Grigsby, Franklin Bhogaraju. "Chirped pulse raman amplifier." Thesis, 2009. http://hdl.handle.net/2152/ETD-UT-2009-12-600.

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All modern terawatt- and petawatt-class laser systems are based on the principle of chirped-pulse amplification (CPA). In this work, a compact subsystem that shifts a micro-joule portion of the chirped pulse energy to a new wavelength outside its original bandwidth, then amplifies it to millijoule energy without adding pump lasers, and without compromising the output of the fundamental CPA system in any significant way, has been developed and integrated into a standard terawatt-class CPA system. In this chirped pulse Raman amplifier sub-system, a 30 mJ portion of a chirped 800 nm fundamental p

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34

Li, Yue-Ying, and 李岳穎. "High-power Femtosecond Pulse Generation in a Chirped-Pulse Amplified Ytterbium-Doped Fiber Laser System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/61637106219008095724.

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碩士<br>國立清華大學<br>光電工程研究所<br>102<br>In this thesis, we demonstrated the chirped pulse amplification (CPA) of a high-power ytterbium-doped fiber amplifier at wavelength of 1064 nm without a stretcher. The all-normal dispersion (ANDi) passively mode-locked fiber laser is used to generate highly chirped seed pulse. Therefore, the pulse stretcher could be optional. The spectrum bandwidth of our ANDi fiber laser is 9 nm which can support 185-fs-width pulses. The actual output pulses width is 11.7 ps. In this case, it is equivalent to -60 times stretching of the seed pulses to reduce the peak power. A

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Lavoie, Jonathan. "Chirped-pulse interferometry: Classical dispersion cancellation and analogues of two-photon quantum interference." Thesis, 2009. http://hdl.handle.net/10012/4812.

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Interference has long been used for precision measurement of path-length changes. Since the advent of the laser, interference has become one of the most versatile tools in metrology. Specifically, ultra-short laser pulses allow unprecedented resolution in absolute length measurements. While ultra-short laser pulses lead to high resolution, for example in white-light interferometry, they are very susceptible to dispersion. Quantum resources have been proposed to overcome some of the problems related to distortions in the interferometric signal. For example, the Hong-Ou-Mandel (HOM) interferome

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Hou, Chuan-Song, and 侯川嵩. "Excimer Laser Ablation of Polymers: Pulse Energy Measurement and Plume Attenuation Effects." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/14377679522938951481.

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碩士<br>國立成功大學<br>機械工程學系<br>89<br>In this work, we use photomultiplier and oscilloscope to measure temporal distribution of the pulse energy of the excimer laser. Then, we combine the rate equation of the concentration of chromophores, the energy equation, the transfer of radiation in material and the plume attenuation effects to predict the etching rate of PMMA by excimer laser. The predicted results are compared with the measurement results. Based on those results, the effects of machining parameters, including beam size, purge air and energy fluence, on the etching rate of polymers are studi

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Pelletier, Etienne. "Development of a New Mid-infrared Source Pumped by an Optical Parametric Chirped-pulse Amplifier." Thesis, 2013. http://hdl.handle.net/1807/35927.

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The mid-infrared (MIR) system presented in the thesis is based on a sub-100-fs erbium-doped fiber laser operating at 1.55 µm. The output of the laser is split in two, each arm seeding an erbium-doped fiber amplifier. The output of the first amplifier is sent to a grating-based stretcher to be stretched to 50 ps before seeding the optical parametric chirped-pulse amplifier (OPCPA). The output of the second amplifier is coupled to a highly nonlinear fiber to generate the 1 µm needed to seed the a neodymium-doped yttrium lithium fluoride (Nd:YLF) system. This work represents the first time this s

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Mackanos, Mark A. "The effect of pulse structure on soft tissue laser ablation at mid-infrared wavelengths." Diss., 2004. http://etd.library.vanderbilt.edu/ETD-db/available/etd-11292004-165251/.

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Sanders, James Christopher. "Terawatt Raman laser system for two-color laser plasma interactions." Thesis, 2014. http://hdl.handle.net/2152/26001.

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In some high-field laser-plasma experiments, it is advantageous to accompany the main high-energy (~1 J) laser with a second high-energy pulse (~0.1 J) which has been frequency-shifted by ~10-20%. Such a pulse-pair would have a low walk-off velocity while remaining spectrally distinct for use in two-color pump-probe experiments. Moreover, by shifting the second pulse by ~plasma frequency, it is theoretically possible to exercise some amount of control over a variety of laser-plasma instabilities, including forward Raman scattering, electromagnetic cascading, and relativistic self-focusing. Alt

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Jeng-Liang, Hsu, and 許正良. "The Study of Diamond-Like Carbon Films Desposited by Pulse Laser Ablation on Glass Substrate." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/01051639451845436451.

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碩士<br>國立臺灣科技大學<br>電子工程技術研究所<br>86<br>Diamond-like-carbon(DLC) films possess marvelous electron field emission properties, viz. low turn-on field(Eo) and large emission current density(Je), and have good potential for using as materials in electron emitters of flat panel display. The feasibility of growing large area thin films with good temperature stability >琍he most important characteristics of the DLC films for this application. In this paper we grow the DLC films on glass substrate, using pulsed laser deposition technique. The effect of st-annealing process on the structure and electron f

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Xu, Zheng-Liang, and 許正良. "The Study of Diamond-Like Carbon Films Desposited by Pulse Laser Ablation on Glass Substrate." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/28413324316839224601.

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碩士<br>國立臺灣科技大學<br>電子工程技術研究所<br>86<br>Diamond-like-carbon(DLC) films possess marvelous electron field emission properties, viz. low turn-on field(Eo) and large emission current density(Je), and have good potential for using as materials in electron emitters of flat panel display. The feasibility of growing large area thin films with good temperature stability >琍he most important characteristics of the DLC films for this application. In this paper we grow the DLC films on glass substrate, using pulsed laser deposition technique. The effect of st-annealing process on the structure and electron f

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Huang, Sheng Wen, and 黃聖文. "Experimental and Theoretical Studies of Chirped-Pulse Amplification of Spectrally Shaped Picosecond Pulses from an All-Normal Dispersion Yb-Fiber Laser." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/4rnu52.

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碩士<br>國立清華大學<br>光電工程研究所<br>103<br>In this thesis, we studied experimentally and theoretically spectrally shaped chirped pulse amplification (CPA) of a high-power ytterbium-doped fiber laser amplifier with a central wavelength at 1064 nm. The seed source is an all-normal dispersion (ANDi) passively mode-locked fiber laser. For the amplified stages, we employ the 10 m-core and 30 m-core non-polarization maintaining Yb-doped fiber to be used in the pre-amplifier and main amplified stages respectively. The seed laser generated pulses with a repetition rate of ~15 MHz, spectral bandwidth ~ 9 nm a

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Alves, Joana Andreia Casanova Ferreira. "Characterization of an OPCPA laser amplifier based on the nonlinear crystal YCOB." Master's thesis, 2015. http://hdl.handle.net/10362/15655.

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The work described in this thesis was performed at the Laboratory for Intense Lasers (L2I) of Instituto Superior Técnico, University of Lisbon (IST-UL). Its main contribution consists in the feasibility study of the broadband dispersive stages for an optical parametric chirped pulse amplifier based on the nonlinear crystal yttrium calcium oxi-borate (YCOB). In particular, the main goal of this work consisted in the characterization and implementation of the several optical devices involved in pulse expansion and compression of the amplified pulses to durations of the order of a few optical

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Ren, Yi Ting, and 任頤庭. "Generation of High-Power Sub-picosecond Pulses by Chirped-Pulse Amplification Technique Based on a Dual-Stage Yitterbium-Doped Polarization Maintaining Fiber Amplifier Seeded by Picosecond All-Normal Dispersion Yb-Fiber Laser." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/28841344985011992788.

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碩士<br>國立清華大學<br>物理系<br>104<br>In the thesis, we studied the chirped pulse amplification (CPA) system based on a dual-stage Yb-doped polarization-maintaining (PM) fibers seeded with a picosecond-scale all-normal dispersion (ANDi) fiber laser with pulse duration of 15 ps and average output power of 50 mW. The dual-stage amplifier was composed of 7-m-long 10-μm Yb-doped PM fiber and 5-m-long 30-μm Yb-doped PM fiber as a pre-amplifier and a main amplifier, respectively. In the experiment, due to strong nonlinearities induced by PM fibers and third order dispersion (TOD) of the fiber stretcher, we

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Wu, Chao-Hsien, and 伍昭憲. "I. On the processing, microstructure and optical properties of Cr-doped willemite-bearing glaze on polycrystalline alumina substrate II. Optical properties, microstructure and phase transformation of ZrO2 nanocondensates via pulse laser ablation condens." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/3r494h.

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(8028629), Piyush Mishra. "Jet-Cooled Molecular Spectroscopy from the Microwave to the Ultraviolet." Thesis, 2019.

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The present thesis shows how versatile and important the field of gas-phase spectroscopy under supersonic expansion conditions can be to understand fundamental intermolecular and intramolecular interactions. We have employed spectroscopic techniques over a very broad range spanning from microwave (2-18 GHz), through infrared (2600-4000 cm-1) and ultraviolet (350-250 nm) region, studying therotational, vibrational and electronic properties,respectively. These techniques use either chirped-pulse based (broadband rotational spectroscopy) or laser based me

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