Thermal lensing induced by end-pumped 1.5 at %Nd : YVO4 laser crystal

The aims of the research is to study the thermal lensing induced by end-pumped 1.5 at % Nd:YVO4 Laser crystal. Diode laser centered at 808 nm was employed as an optical pumping source. Using CCD camera, the laser beam spot was recorded. And it was found that the beam spot diameter linearly increased...

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Main Author:	Mohamed Hassan, Hussein
Format:	Thesis
Language:	English
Published:	2012
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/41749/5/HusseinMohamedHassanMFS2012.pdf
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id	my-utm-ep.41749
record_format	uketd_dc
spelling	my-utm-ep.417492017-09-21T09:28:52Z Thermal lensing induced by end-pumped 1.5 at %Nd : YVO4 laser crystal 2012-06 Mohamed Hassan, Hussein TK Electrical engineering. Electronics Nuclear engineering The aims of the research is to study the thermal lensing induced by end-pumped 1.5 at % Nd:YVO4 Laser crystal. Diode laser centered at 808 nm was employed as an optical pumping source. Using CCD camera, the laser beam spot was recorded. And it was found that the beam spot diameter linearly increased as the pumping power .The crystal has poor thermal conductivity compared to the other laser crystal. Neglecting the thermal birefringence effect on the gain medium, and using the optical characteristics of the a–cut of the Nd: YVO4, thermal lensing due to heat deposited in diode end-pumped a 1.5 at % Nd:YVO4 crystal was investigated. The focal length of the thermal lens was obtained to be exponentially decreasing with respect to pumping power, implies that the higher the pumping power the shorter the focal length thus the greater the aberration effect which degrade the beam quality.M2 factor technique was used to measure the beam quality. The results proved that the beam quality become poor as indicates by the increasing of M2 factor. 2012-06 Thesis http://eprints.utm.my/id/eprint/41749/ http://eprints.utm.my/id/eprint/41749/5/HusseinMohamedHassanMFS2012.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Mohamed Hassan, Hussein Thermal lensing induced by end-pumped 1.5 at %Nd : YVO4 laser crystal
description	The aims of the research is to study the thermal lensing induced by end-pumped 1.5 at % Nd:YVO4 Laser crystal. Diode laser centered at 808 nm was employed as an optical pumping source. Using CCD camera, the laser beam spot was recorded. And it was found that the beam spot diameter linearly increased as the pumping power .The crystal has poor thermal conductivity compared to the other laser crystal. Neglecting the thermal birefringence effect on the gain medium, and using the optical characteristics of the a–cut of the Nd: YVO4, thermal lensing due to heat deposited in diode end-pumped a 1.5 at % Nd:YVO4 crystal was investigated. The focal length of the thermal lens was obtained to be exponentially decreasing with respect to pumping power, implies that the higher the pumping power the shorter the focal length thus the greater the aberration effect which degrade the beam quality.M2 factor technique was used to measure the beam quality. The results proved that the beam quality become poor as indicates by the increasing of M2 factor.
format	Thesis
qualification_level	Master's degree
author	Mohamed Hassan, Hussein
author_facet	Mohamed Hassan, Hussein
author_sort	Mohamed Hassan, Hussein
title	Thermal lensing induced by end-pumped 1.5 at %Nd : YVO4 laser crystal
title_short	Thermal lensing induced by end-pumped 1.5 at %Nd : YVO4 laser crystal
title_full	Thermal lensing induced by end-pumped 1.5 at %Nd : YVO4 laser crystal
title_fullStr	Thermal lensing induced by end-pumped 1.5 at %Nd : YVO4 laser crystal
title_full_unstemmed	Thermal lensing induced by end-pumped 1.5 at %Nd : YVO4 laser crystal
title_sort	thermal lensing induced by end-pumped 1.5 at %nd : yvo4 laser crystal
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2012
url	http://eprints.utm.my/id/eprint/41749/5/HusseinMohamedHassanMFS2012.pdf
_version_	1747816609246871552

Thermal lensing induced by end-pumped 1.5 at %Nd : YVO4 laser crystal

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