Efficiency at various length 1 at % neodymium doped yttrium orthovanadate (Nd:YVO4) crystal

Orthovanadate crystal is well known as a gain medium. However in scale-up the output power some parameters of the crystals have to be considered. This included the thickness or the length of the bar crystal. Therefore the aim of this project is to investigate best choice of length of 1 at % Nd:YVO4...

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Main Author:	Andrew, Shirley Arvilla
Format:	Thesis
Language:	English
Published:	2011
Subjects:	Q Science (General)
Online Access:	http://eprints.utm.my/id/eprint/32040/1/ShirleyArvillaAndrewMFS2011.pdf
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spelling	my-utm-ep.320402018-05-27T07:11:02Z Efficiency at various length 1 at % neodymium doped yttrium orthovanadate (Nd:YVO4) crystal 2011-05 Andrew, Shirley Arvilla Q Science (General) Orthovanadate crystal is well known as a gain medium. However in scale-up the output power some parameters of the crystals have to be considered. This included the thickness or the length of the bar crystal. Therefore the aim of this project is to investigate best choice of length of 1 at % Nd:YVO4 crystal for the best laser performance. In attempt to achieve this goal, various lengths of bar crystal were under studied including 1.15, 3.00 and 10.00 mm. The crystals were longitudinally pumped by diode laser. The laser output was measured using powermeter, spectrum analyzer and CCD video camera. The beam spot of the laser outputs were recorded using CCD video camera. The Nd:YVO4 output beam spectrum centered at 1063.93 nm with linewidth of 0.70 nm. The output power for 1.15 and 3.00 mm crystals showed spontaneous emission in the initial stage. This followed by stimulated emission after exceeding threshold point. In the case for 10.00 mm crystal merely shows the spontaneous emission process. The limited pumping power does not allow lasing to occur from 10.00 mm crystal. The optimized length of 1 at % Nd:YVO4 crystals was found to be from the 3.00 mm crystal with slope efficiency of 4.51% and threshold power of 1921 mW. Meanwhile for 1.15 mm crystal manage to produce an efficiency of 1.07 % with threshold power of 2400 mW. The exciting beam for 10.00 mm crystal was dissipated and dispersed in the bulk of crystal causing spontaneous without stimulated emission. 2011-05 Thesis http://eprints.utm.my/id/eprint/32040/ http://eprints.utm.my/id/eprint/32040/1/ShirleyArvillaAndrewMFS2011.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	Q Science (General)
spellingShingle	Q Science (General) Andrew, Shirley Arvilla Efficiency at various length 1 at % neodymium doped yttrium orthovanadate (Nd:YVO4) crystal
description	Orthovanadate crystal is well known as a gain medium. However in scale-up the output power some parameters of the crystals have to be considered. This included the thickness or the length of the bar crystal. Therefore the aim of this project is to investigate best choice of length of 1 at % Nd:YVO4 crystal for the best laser performance. In attempt to achieve this goal, various lengths of bar crystal were under studied including 1.15, 3.00 and 10.00 mm. The crystals were longitudinally pumped by diode laser. The laser output was measured using powermeter, spectrum analyzer and CCD video camera. The beam spot of the laser outputs were recorded using CCD video camera. The Nd:YVO4 output beam spectrum centered at 1063.93 nm with linewidth of 0.70 nm. The output power for 1.15 and 3.00 mm crystals showed spontaneous emission in the initial stage. This followed by stimulated emission after exceeding threshold point. In the case for 10.00 mm crystal merely shows the spontaneous emission process. The limited pumping power does not allow lasing to occur from 10.00 mm crystal. The optimized length of 1 at % Nd:YVO4 crystals was found to be from the 3.00 mm crystal with slope efficiency of 4.51% and threshold power of 1921 mW. Meanwhile for 1.15 mm crystal manage to produce an efficiency of 1.07 % with threshold power of 2400 mW. The exciting beam for 10.00 mm crystal was dissipated and dispersed in the bulk of crystal causing spontaneous without stimulated emission.
format	Thesis
qualification_level	Master's degree
author	Andrew, Shirley Arvilla
author_facet	Andrew, Shirley Arvilla
author_sort	Andrew, Shirley Arvilla
title	Efficiency at various length 1 at % neodymium doped yttrium orthovanadate (Nd:YVO4) crystal
title_short	Efficiency at various length 1 at % neodymium doped yttrium orthovanadate (Nd:YVO4) crystal
title_full	Efficiency at various length 1 at % neodymium doped yttrium orthovanadate (Nd:YVO4) crystal
title_fullStr	Efficiency at various length 1 at % neodymium doped yttrium orthovanadate (Nd:YVO4) crystal
title_full_unstemmed	Efficiency at various length 1 at % neodymium doped yttrium orthovanadate (Nd:YVO4) crystal
title_sort	efficiency at various length 1 at % neodymium doped yttrium orthovanadate (nd:yvo4) crystal
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2011
url	http://eprints.utm.my/id/eprint/32040/1/ShirleyArvillaAndrewMFS2011.pdf
_version_	1747815906803712000

Efficiency at various length 1 at % neodymium doped yttrium orthovanadate (Nd:YVO4) crystal

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