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Dissertations / Theses on the topic 'YAG Pulsed lasers'

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Published: 2 June 2025
Last updated: 31 July 2025

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1

BERGEON, MURIELE. "Etude et realisation de microlasers declenches et de microlasers balayes en longueur d'onde, compatibles avec un procede de fabrication collectif." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10248.

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Le microlaser est un laser a etat solide miniature (<1mm#3), dont les miroirs de la cavite sont directement deposes sur le milieu a gain. De nombreuses applications demandent un fonctionnement impulsionnel ou balaye en longueur d'onde (telemetrie, detection de gaz, marquage). En inserant un cristal electrooptique a l'interieur de la cavite laser, des microlasers a emission declenchee et des microlasers a emission balayee en longueur d'onde ont ete realises. Les dispositifs concus sont constitues de yag:nd et de tantalate de lithium, ils sont stabilises en temperature et donnent une emission la
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2

Shen, Hanfei M. 1979. "Ultrashort pulse generation with solid state Cr⁴⁺:YAG laser." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/87850.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2003.<br>Includes bibliographical references (p. 127-130).<br>by Hanfei M. Shen.<br>S.M.
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3

Ribau, Humberto Miranda. "Soldadura laser pulsado Nd: YAG entre metais dissimulares." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/23358.

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Mestrado em Engenharia Mecânica<br>A presente investigação consiste no estudo experimental das propriedades mecânicas induzidas pela soldadura laser em chapas de materiais metálicos dissimilares, nomeadamente, aço de alta resistência dual-phase (DP) 600 com aço de alta resistência dual-phase (DP) 1000 e liga de alumínio AA6060-T6 com liga de titânio Ti-6Al-4V. No caso dos aços dual-phase, o estudo foi realizado em amostras de 0,8 mm de espessura, numa junta do tipo topo a topo. Após a seleção dos parâmetros mais adequados para a soldadura, foram efetuados ensaios de tração aos provetes soldad
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4

Conlon, Patrick Joseph. "Ultra-short pulse generation with a Cr'4'+:YAG laser." Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320180.

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5

Franzini, Otacilio Donisete [UNESP]. "Aplicação de laser pulsado Nd:YAG na soldagem do aço super duplex UNS S32750." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/146743.

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Submitted by OTACILIO DONISETE FRANZINI null (otaciliodf@hotmail.com) on 2016-12-21T11:37:28Z No. of bitstreams: 1 APLICAÇÃO DE LASER PULSADO Nd YAG NA SOLDAGEM DO AÇO SUPER DUPLEX UNS S32750.pdf: 3133785 bytes, checksum: 7f73ce4a1615cca31edb63d392f368f2 (MD5)<br>Approved for entry into archive by Felipe Augusto Arakaki (arakaki@reitoria.unesp.br) on 2016-12-22T12:59:13Z (GMT) No. of bitstreams: 1 franzini_od_me_ilha.pdf: 3133785 bytes, checksum: 7f73ce4a1615cca31edb63d392f368f2 (MD5)<br>Made available in DSpace on 2016-12-22T12:59:13Z (GMT). No. of bitstreams: 1 franzini_od_me_ilha.pdf: 3
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Franzini, Otacilio Donisete. "Aplicação de laser pulsado Nd:YAG na soldagem do aço super duplex UNS S32750 /." Ilha Solteira, 2016. http://hdl.handle.net/11449/146743.

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Orientador: Vicente Afonso Ventrella<br>Resumo: Os aços inoxidáveis Duplex e Super Duplex, 50% austenita e 50% ferrita, combinam as características mais desejáveis dos aços ferríticos e austeníticos, possuem excelente resistência mecânica e à corrosão para uma ampla variedade de meios, com expressiva resistência à corrosão em água do mar e outros ambientes contendo cloreto, devido a seu elevado nível de cromo, molibdênio, e nitrogênio. Quando soldado a região do metal de solda desses aços perdem suas características de resistência mecânica e à corrosão devido ao desbalanceamento das fases ferr
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7

Faria, Irval Cardoso de. "Geração de pulsos laser ultracurtos por auto injeção no laser de Nd : YAG." [s.n.], 1986. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277323.

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Orientadores: Antonio G. J. Balbin Villaverde, Carlos Henrique de Brito Cruz<br>Dissertação (mestrado) - Universidade Estadual de Campinas. Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-07-14T17:29:44Z (GMT). No. of bitstreams: 1 Faria_IrvalCardosode_M.pdf: 3715552 bytes, checksum: 00ff19e6dc53faa98f68904fa803867a (MD5) Previous issue date: 1986<br>Resumo: Não informado<br>Abstract: Not informed.<br>Mestrado<br>Física<br>Mestre em Física
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8

Origo, Fabio Dondeo. "Cristalização epitaxial de ligas de SiGe sobre GaAs por laser pulsado." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278005.

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Orientador: Ivan E. Chambouleyron<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-03T23:11:41Z (GMT). No. of bitstreams: 1 Origo_FabioDondeo_D.pdf: 2612005 bytes, checksum: 49cccd9932debc21d33d8d86b82f22d2 (MD5) Previous issue date: 2004<br>Resumo: Neste trabalho se estudou pela primeira vez a cristalização e a epitaxia por laser pulsado para a obtenção de filmes de SixG e1-x(x = 0, 0.1, 0,25, 0,5, 0,75 e 1) sobre substratos de GaAs. Foram utilizados pulsos de laser de Nd:Yag ¿ l =532 nm ¿ com duração de 7ns e
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9

Silva, André César da. "Desenvolvimento de um laser pulsado de Nd : YAG de alta radiância para aplicações em óptica não-linear." Instituto Tecnológico de Aeronáutica, 1988. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=1883.

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Foi projetada uma cavidade óptica estável incorporando um telescópio de magniticação 3, para a obtenção de um laser pulsado de Nd:YAG de alta radiância. São verificadas as seguintes vantagens deste tipo de cavidade sobre as cavidades usuais: 1) a potência do laser é menos sensível ao alinhamento dos espelhos; 2) permite o casamento do volume do modo fundamental transversal com o volume do meio ativo, possibilitando a extracação de máxima energia neste modo; 3) o fator de estabilidade pode ser ajustado pela defocagem do telescópio para a condição de máxima estabilidade; 4) as caracteristicas d
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10

Lohbreier, Jan. "Characterization and Optimization of High-order Harmonics after Adaptive Pulse Shaping." kostenfrei, 2008. http://www.opus-bayern.de/uni-wuerzburg/volltexte/2009/3047/.

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11

Favre, Sébastian. "Génération de deuxième et troisième harmonique avec un laser Nd : YAG en régime pulsé libre /." [S.l.] : [s.n.], 2001. http://library.epfl.ch/theses/?nr=2349.

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12

Mariscal, Muñoz Eduardo [UNESP]. "Diferenciação de osteoblastos cultivados sobre superfícies de titânio modificados por irradiação com laser Yb: YAG pulsado de alta potencia." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/97275.

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Made available in DSpace on 2014-06-11T19:28:38Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-04-06Bitstream added on 2014-06-13T19:16:49Z : No. of bitstreams: 1 mariscalmunoz_e_me_arafo.pdf: 3090290 bytes, checksum: 16c5f9ca343ea1d3e9b942ecb341ffbb (MD5)<br>A osseointegração, requisito indispensável para o sucesso dos implantes dentários, é um processo lento, caracterizado, sequencialmente, pelas etapas de adesão, diferenciação e proliferação celular, bem como pela aposição e mineralização da matriz óssea depositada por osteoblastos. Acelerar o processo de osseointegração significa
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13

Mariscal, Muñoz Eduardo. "Diferenciação de osteoblastos cultivados sobre superfícies de titânio modificados por irradiação com laser Yb : YAG pulsado de alta potencia /." Araraquara : [s.n.], 2013. http://hdl.handle.net/11449/97275.

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Orientador: Carlos Alberto de Souza Costa<br>Coorientador: Pedro Paulo Chaves de Souza<br>Banca: Raphael Freitas de Souza<br>Banca: Francisco de Assis Mollo Junior<br>Resumo: A osseointegração, requisito indispensável para o sucesso dos implantes dentários, é um processo lento, caracterizado, sequencialmente, pelas etapas de adesão, diferenciação e proliferação celular, bem como pela aposição e mineralização da matriz óssea depositada por osteoblastos. Acelerar o processo de osseointegração significa reduzir o tempo de espera para a aplicação segura de uma carga funcional sobre os implantes de
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14

Sanitá, Willian Roberto Valicelli. "Análise de juntas soldadas de aço API 5L X-70 com laser Nd : YAG pulsado /." Ilha Solteira, 2017. http://hdl.handle.net/11449/149831.

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Orientador: Vicente Afonso Ventrella<br>Resumo: We carried out a study of laser welding provided "bead on plate" in micro-alloyed steel ARBL API 5L Gr. X70 in the form of plates with 1,0 x 20 x 120 mm (H x W x D). 12 welds was performed in argonic gas flow of 15 l/min, beam diameter 0,2 mm, angle of 90°, repetition rate of 9, 8, 7, 6 and 5 Hz, welding speed of 1 mm/s, gas depths focus equal to 0,57 mm below the surface of the workpiece and the pulse energy (Ep) set at 10,0 J. The time width (Lt) set at 10 ms. The heat input was varied at 90, 80, 70, 60 and 50 J/mm. The results were analyzed ba
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15

Sanitá, Willian Roberto Valicelli [UNESP]. "Análise de juntas soldadas de aço API 5L X-70 com laser Nd: YAG pulsado." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/149831.

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Submitted by WILLIAN ROBERTO VALICELLI SANITÁ null (willian.r.sanita@gmail.com) on 2017-03-17T01:27:33Z No. of bitstreams: 1 API 5L X-70 NdYAG - REV-00.pdf: 14588761 bytes, checksum: 027f498ff74dcf88e5b24148813899ae (MD5)<br>Approved for entry into archive by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br) on 2017-03-21T18:52:02Z (GMT) No. of bitstreams: 1 sanita_wrv_me_ilha.pdf: 14588761 bytes, checksum: 027f498ff74dcf88e5b24148813899ae (MD5)<br>Made available in DSpace on 2017-03-21T18:52:02Z (GMT). No. of bitstreams: 1 sanita_wrv_me_ilha.pdf: 14588761 bytes, checksum: 027f
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16

Arndt, Phillip Todd. "PROBING THE EXCITED ROVIBRATIONAL STATES OF SODIUM DIMERS." Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1438641133.

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17

Niederkrüger, Matthias, Christian Salb, Michael Beck, Niko Hildebrandt, Hans-Gerd Löhmannsröben, and Gerd Marowsky. "Improvement of a fluorescence immunoassay with a compact diode-pumped solid state laser at 315 nm." Universität Potsdam, 2006. http://opus.kobv.de/ubp/volltexte/2006/1015/.

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We demonstrate the improvement of fluorescence immunoassay (FIA) diagnostics in deploying a newly developed compact diode-pumped solid state (DPSS) laser with emission at 315 nm. The laser is based on the quasi-three-level transition in Nd:YAG at 946 nm. The pulsed operation is either realized by an active Q-switch using an electro-optical device or by introduction of a Cr<SUP>4+</SUP>:YAG saturable absorber as passive Q-switch element. By extra-cavity second harmonic generation in different nonlinear crystal media we obtained blue light at 473 nm. Subsequent mixing of the fundamental and the
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18

Xu, Qian-Tian, and 許千添. "Pulse compressed Nd: YAG laser and its application." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/40194945670989844206.

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19

Chien, Hao-Wen, and 簡浩文. "A study of continuous-wave and pulsed operations of Nd:YVO4/Cr4+:YAG laser." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/35525630404153941125.

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碩士<br>淡江大學<br>物理學系碩士班<br>94<br>The continuous-wave (CW) and pulsed modes of operation of a Nd:YVO4/Cr4+:YAG laser and the transition between the two modes have been investigated. The laser is end-pumped by a diode laser, and it has a linear cavity which is close to a hemispherical one; thus, the beam size within the cavity varies significantly. In experiment, a Cr4+:YAG crystal with an initial transmittance of 87.8% at 1064 nm was used as a saturable absorber, and the second threshold condition can be tested by varying the position of the saturable absorber. It was found that because of the ov
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20

Xu, Leo, and 許榮烈. "Study of Pulsed Nd-YAG Laser Cladding Ceramic-Metal Composite Coatings on Al-Alloy." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/78312571849855320449.

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21

Sahu, J. K. "TiB2-TiC-Al2O3 coating on Aluminium substrate by in-situ laser coating process using pulsed Nd: YAG laser." Thesis, 2014. http://ethesis.nitrkl.ac.in/5792/1/E-8.pdf.

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To improve the microhardness and wear resistance of mechanical components, laser coating has been applied to deposit in situ TiB2-TiC-Al2O3 coating on Aluminium substrate using Titanium oxide, Boron carbide and Aluminium as the coating powder. The phase constituents and microstructure of the composite coating were investigated using field emission scanning electron micrograph (SEM) and X-ray diffraction (XRD). Vicker’s Microhardness tester was used to measure the microhardness at the coating cross section. Results show that crack free composite coating with metallurgical bonding to the alumini
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22

Su, Andrew, and 蘇恩賜. "Pulsed Nd-YAG Laser Cobalt-Base and Nickel-Base Powder Cladding and its Wear Performance Investigation." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/56346385598757421295.

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碩士<br>國立成功大學<br>製造工程研究所<br>87<br>The mechanical components surface would be demolish by wearing and may cause the failure of the machine after a long time working. In order to keep the ductileness and malleableness of the inner metal to against the external impact, hardfacing technique is used to improve the wear resistance of the component surface. Owing to the many adventages of laser material processing, laser cladding attain to hardfacing. In this research, high precision, efficiency pulsed Nd-Yag laser is used as the heating source. Three process parameters of laser cladding: p
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23

Chen, Yi-Jing, and 陳怡靜. "A Study of Fluxless Reflow Soldering of Eutectic Solder Ball Using Pulse YAG Laser." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/87662687688017552565.

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碩士<br>國立交通大學<br>材料科學與工程系所<br>94<br>This work studied the fluxless reflow soldering of eutectic solder ball on copper (Cu) pad utilizing pulse YAG laser. The effects of soldering conditions including laser power density, pulse width (i.e., the irradiation time) and reflow times on the morphology, microstructure and shear strength of solder joint were investigated. The experimental results revealed that the solder joints exhibit better shape and bonding strength when they were soldered at the conditions of lower power density and larger pulse width. The observation using scanning electron micros
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24

Yao-TingTsai and 蔡耀庭. "Characterization of the pulsed Nd-YAG laser cladding with the pre-placed metal powder/resin hybrid method." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/74907117752580562693.

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25

Sheng-WeiLin and 林昇緯. "Study of the metal powder/resin cladding system with the multi-pulse Nd-YAG laser." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/46311795561874980258.

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碩士<br>國立成功大學<br>機械工程學系碩博士班<br>100<br>The purpose of this thesis is to characterize the metal powder/resin cladding system with the Nd-YAG laser numerically and experimentally. In the numerical simulation, the FLUENT software was applied to simulate the flow field of the resin output from a feeder nozzle on a substrate with various outlet heights and output times. In the experiment, the distribution of the metal powder/resin composite layer has been visualized. The multi-pulse cladding was made by the pulsed Nd-YAG laser. Furthermore the cladding specimen was verified by micro tensile test
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