Design and characterization of a flexible diode pumped solid state laser neodymium orthovanadate

The main goal of this research is to determine temperature variation of stimulated emission cross section of laser crystal through alternative method. Neodymium-doped yttrium vanadate (Nd:YVO4) laser crystal has been utilized as the gain medium. A 808 nm laser diode was employed as the pumping sourc...

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Main Author:	Krishnan, Ganesan
Format:	Thesis
Language:	English
Published:	2014
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/78033/1/GanesanKrishnanPFS2014.pdf
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spelling	my-utm-ep.780332018-07-23T06:05:27Z Design and characterization of a flexible diode pumped solid state laser neodymium orthovanadate 2014-11 Krishnan, Ganesan QC Physics The main goal of this research is to determine temperature variation of stimulated emission cross section of laser crystal through alternative method. Neodymium-doped yttrium vanadate (Nd:YVO4) laser crystal has been utilized as the gain medium. A 808 nm laser diode was employed as the pumping source. A laser system was designed and then a prototype was created. Performance of the laser system was quantified with 97 % reflective at 1064 nm output coupler. It was found that slope efficiency and threshold power of the system were 46.9 % and 0.109 W respectively. The focal power of the laser crystal was varied with absorbed pump power at a rate of 0.228 D/W. From output fluorescence spectrums recorded at various crystal temperatures, variation of linewidth, wavelength and intensity of 1064 nm emission were determined. The rate of change of linewidth, wavelength and intensity with temperature were 5.4 pm/oC, 3.7 pm/oC and 0.075 arb. unit/oC respectively. Through spectroscopic method, stimulated emission cross section variation with temperature was found to be -0.462 %/oC with respect to stimulated emission cross section at 20 oC. For stimulated emission cross section determination through performance method, larger pump beam radius and 70 % reflectivity at 1064 nm output coupler were used. To obtain linear graph, a graph of Pout/f1 against Pabs was drawn. At 30 oC, gradient of the graph, threshold power and cavity loss were found to be 46.6 %, 0.760 W and 6.6 % respectively. Through performance method, stimulated emission cross section variation with temperature was found to be -0.447 %/oC with respect to stimulated emission cross section at 20 oC. The change of stimulated emission cross section with temperature obtained through performance method is in good agreement with spectroscopic method. 2014-11 Thesis http://eprints.utm.my/id/eprint/78033/ http://eprints.utm.my/id/eprint/78033/1/GanesanKrishnanPFS2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:98113 phd doctoral 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 Krishnan, Ganesan Design and characterization of a flexible diode pumped solid state laser neodymium orthovanadate
description	The main goal of this research is to determine temperature variation of stimulated emission cross section of laser crystal through alternative method. Neodymium-doped yttrium vanadate (Nd:YVO4) laser crystal has been utilized as the gain medium. A 808 nm laser diode was employed as the pumping source. A laser system was designed and then a prototype was created. Performance of the laser system was quantified with 97 % reflective at 1064 nm output coupler. It was found that slope efficiency and threshold power of the system were 46.9 % and 0.109 W respectively. The focal power of the laser crystal was varied with absorbed pump power at a rate of 0.228 D/W. From output fluorescence spectrums recorded at various crystal temperatures, variation of linewidth, wavelength and intensity of 1064 nm emission were determined. The rate of change of linewidth, wavelength and intensity with temperature were 5.4 pm/oC, 3.7 pm/oC and 0.075 arb. unit/oC respectively. Through spectroscopic method, stimulated emission cross section variation with temperature was found to be -0.462 %/oC with respect to stimulated emission cross section at 20 oC. For stimulated emission cross section determination through performance method, larger pump beam radius and 70 % reflectivity at 1064 nm output coupler were used. To obtain linear graph, a graph of Pout/f1 against Pabs was drawn. At 30 oC, gradient of the graph, threshold power and cavity loss were found to be 46.6 %, 0.760 W and 6.6 % respectively. Through performance method, stimulated emission cross section variation with temperature was found to be -0.447 %/oC with respect to stimulated emission cross section at 20 oC. The change of stimulated emission cross section with temperature obtained through performance method is in good agreement with spectroscopic method.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Krishnan, Ganesan
author_facet	Krishnan, Ganesan
author_sort	Krishnan, Ganesan
title	Design and characterization of a flexible diode pumped solid state laser neodymium orthovanadate
title_short	Design and characterization of a flexible diode pumped solid state laser neodymium orthovanadate
title_full	Design and characterization of a flexible diode pumped solid state laser neodymium orthovanadate
title_fullStr	Design and characterization of a flexible diode pumped solid state laser neodymium orthovanadate
title_full_unstemmed	Design and characterization of a flexible diode pumped solid state laser neodymium orthovanadate
title_sort	design and characterization of a flexible diode pumped solid state laser neodymium orthovanadate
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2014
url	http://eprints.utm.my/id/eprint/78033/1/GanesanKrishnanPFS2014.pdf
_version_	1747817890841624576

Design and characterization of a flexible diode pumped solid state laser neodymium orthovanadate

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