Performance of ND:YVO4 diode pumped solid state laser in second harmonic generation and Q-switching

Diode pumped solid state laser (DPSS) is one of the most popular types of laser due to its small size and low cost. However, the performance of such DPSS laser remains unstable. This instability depends on many factors including the doping level, crystal lengths and the cooling system. In order to a...

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Main Author:	Khamsan, Nur Ezaan
Format:	Thesis
Language:	English
Published:	2012
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/32413/5/NurEzaanKhamsanMFS2012.pdf
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spelling	my-utm-ep.324132017-09-30T07:03:40Z Performance of ND:YVO4 diode pumped solid state laser in second harmonic generation and Q-switching 2012-07 Khamsan, Nur Ezaan QC Physics Diode pumped solid state laser (DPSS) is one of the most popular types of laser due to its small size and low cost. However, the performance of such DPSS laser remains unstable. This instability depends on many factors including the doping level, crystal lengths and the cooling system. In order to achieve high efficiency and good quality laser, a fundamental diode pumped solid laser was designed, constructed and optimized. In this study, vanadate crystals at different doping levels comprised of 0.5, 1.0 and 1.5 at. % and thickness of 1, 3, and 10 mm were employed as a gain medium. Diode laser centered at 808 nm was used with end pumped technique. The threshold power was optimized using various kind of output coupler including 40, 45, 50, 60, 70 and 75 %. The laser was further modulated by inserting a number of nonlinear materials including KTP to produce second harmonic generation signals. Cr4+:YAG saturable absorber has been used for passive Q-switching technique. Analysis shows that the gain medium with 1.5 at. % is identified as the best doping level with low threshold power and high slope efficiency of 30 %. The best thickness of the crystal bar is identified to be at 3 mm having performance of 55 % slope efficiency with threshold power of 0.6890 W. The output coupler of 75 % reflectivity having slopeefficiency of 54 % with lower threshold power of 0.3974 W, whereas half wave plate is capable to convert almost 95 % to second harmonic generation SHG with threshold power of 0.0063 W. Pulse duration of Q-switched laser is found to be inversely proportional to the input current. 2012-07 Thesis http://eprints.utm.my/id/eprint/32413/ http://eprints.utm.my/id/eprint/32413/5/NurEzaanKhamsanMFS2012.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:70198?site_name=Restricted Repository masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QC Physics
spellingShingle	QC Physics Khamsan, Nur Ezaan Performance of ND:YVO4 diode pumped solid state laser in second harmonic generation and Q-switching
description	Diode pumped solid state laser (DPSS) is one of the most popular types of laser due to its small size and low cost. However, the performance of such DPSS laser remains unstable. This instability depends on many factors including the doping level, crystal lengths and the cooling system. In order to achieve high efficiency and good quality laser, a fundamental diode pumped solid laser was designed, constructed and optimized. In this study, vanadate crystals at different doping levels comprised of 0.5, 1.0 and 1.5 at. % and thickness of 1, 3, and 10 mm were employed as a gain medium. Diode laser centered at 808 nm was used with end pumped technique. The threshold power was optimized using various kind of output coupler including 40, 45, 50, 60, 70 and 75 %. The laser was further modulated by inserting a number of nonlinear materials including KTP to produce second harmonic generation signals. Cr4+:YAG saturable absorber has been used for passive Q-switching technique. Analysis shows that the gain medium with 1.5 at. % is identified as the best doping level with low threshold power and high slope efficiency of 30 %. The best thickness of the crystal bar is identified to be at 3 mm having performance of 55 % slope efficiency with threshold power of 0.6890 W. The output coupler of 75 % reflectivity having slopeefficiency of 54 % with lower threshold power of 0.3974 W, whereas half wave plate is capable to convert almost 95 % to second harmonic generation SHG with threshold power of 0.0063 W. Pulse duration of Q-switched laser is found to be inversely proportional to the input current.
format	Thesis
qualification_level	Master's degree
author	Khamsan, Nur Ezaan
author_facet	Khamsan, Nur Ezaan
author_sort	Khamsan, Nur Ezaan
title	Performance of ND:YVO4 diode pumped solid state laser in second harmonic generation and Q-switching
title_short	Performance of ND:YVO4 diode pumped solid state laser in second harmonic generation and Q-switching
title_full	Performance of ND:YVO4 diode pumped solid state laser in second harmonic generation and Q-switching
title_fullStr	Performance of ND:YVO4 diode pumped solid state laser in second harmonic generation and Q-switching
title_full_unstemmed	Performance of ND:YVO4 diode pumped solid state laser in second harmonic generation and Q-switching
title_sort	performance of nd:yvo4 diode pumped solid state laser in second harmonic generation and q-switching
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2012
url	http://eprints.utm.my/id/eprint/32413/5/NurEzaanKhamsanMFS2012.pdf
_version_	1747815996687646720

Performance of ND:YVO4 diode pumped solid state laser in second harmonic generation and Q-switching

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