Spectroscopic properties of Nd : YAG laser pumped by flashlamp at various temperatures and input energies

The purpose of this research was to investigate the temperature and energy input dependency of Nd:YAG laser performance pumped by flashlamp. A commercial laser rod Nd:YAG crystal was utilized as a gain medium. The laser rod was placed parallel to a linear flashlamp filled with xenon gas at 450 Torr....

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Main Author:	Pourmand, Seyed Ebrahim
Format:	Thesis
Language:	English
Published:	2013
Subjects:	Q Science (General)
Online Access:	http://eprints.utm.my/id/eprint/43968/5/SyedEbrahimPourmandPFS2013.pdf
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spelling	my-utm-ep.439682021-05-11T01:57:26Z Spectroscopic properties of Nd : YAG laser pumped by flashlamp at various temperatures and input energies 2013-10 Pourmand, Seyed Ebrahim Q Science (General) The purpose of this research was to investigate the temperature and energy input dependency of Nd:YAG laser performance pumped by flashlamp. A commercial laser rod Nd:YAG crystal was utilized as a gain medium. The laser rod was placed parallel to a linear flashlamp filled with xenon gas at 450 Torr. The Nd:YAG crystal together with the flashlamp were flooded with a coolant comprising of a mixture of 60% ethylene glycol and 40% distilled water which covers a range of temperature from -30?C to +60?C. Spectroscopic properties of the Nd:YAG rod under pulsed flashlamp pumping was investigated from the output fluorescence spectrum of the flashlamp radiation and the Nd:YAG rod. The linewidth of each fluorescence line was measured for estimation of effective emission cross section and saturation intensity. The influence of temperature and input energy on fluorescence emission cross section of Nd3+:YAG crystal was studied. The cross section was found to decrease as the temperature and the input energy were increased. The inter-stark emission showed Lorentzian line shape indicating homogeneous broadening. This was attributed to the thermal broadening mechanism of the emission line. The spectral widths and shifts of the emission lines for the three and four level inter-Stark transitions within the respective intermanifold transitions of 4F3/2›4I9/2 and 4F3/2›4I11/2 were investigated over the range of 0 to 75 J. The emission lines for the 4F3/2›4I9/2 transitions shifted towards a longer wavelength and broadened, while the positions and linewidths for the 4F3/2›4I11/2 transitions remained unchanged with increasing input energy. Finally the temperature dependence of quasi three level laser transitions for long pulse Nd:YAG laser was also investigated. The laser performance at 938.5 nm and 946.0 nm were also found to be inversely proportional with temperature and the slope efficiency was unchanged to temperature. The reduction was due to the mechanism of phonon scattering as well as broadening effect as the temperature increases. 2013-10 Thesis http://eprints.utm.my/id/eprint/43968/ http://eprints.utm.my/id/eprint/43968/5/SyedEbrahimPourmandPFS2013.pdf application/pdf en public phd doctoral 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) Pourmand, Seyed Ebrahim Spectroscopic properties of Nd : YAG laser pumped by flashlamp at various temperatures and input energies
description	The purpose of this research was to investigate the temperature and energy input dependency of Nd:YAG laser performance pumped by flashlamp. A commercial laser rod Nd:YAG crystal was utilized as a gain medium. The laser rod was placed parallel to a linear flashlamp filled with xenon gas at 450 Torr. The Nd:YAG crystal together with the flashlamp were flooded with a coolant comprising of a mixture of 60% ethylene glycol and 40% distilled water which covers a range of temperature from -30?C to +60?C. Spectroscopic properties of the Nd:YAG rod under pulsed flashlamp pumping was investigated from the output fluorescence spectrum of the flashlamp radiation and the Nd:YAG rod. The linewidth of each fluorescence line was measured for estimation of effective emission cross section and saturation intensity. The influence of temperature and input energy on fluorescence emission cross section of Nd3+:YAG crystal was studied. The cross section was found to decrease as the temperature and the input energy were increased. The inter-stark emission showed Lorentzian line shape indicating homogeneous broadening. This was attributed to the thermal broadening mechanism of the emission line. The spectral widths and shifts of the emission lines for the three and four level inter-Stark transitions within the respective intermanifold transitions of 4F3/2›4I9/2 and 4F3/2›4I11/2 were investigated over the range of 0 to 75 J. The emission lines for the 4F3/2›4I9/2 transitions shifted towards a longer wavelength and broadened, while the positions and linewidths for the 4F3/2›4I11/2 transitions remained unchanged with increasing input energy. Finally the temperature dependence of quasi three level laser transitions for long pulse Nd:YAG laser was also investigated. The laser performance at 938.5 nm and 946.0 nm were also found to be inversely proportional with temperature and the slope efficiency was unchanged to temperature. The reduction was due to the mechanism of phonon scattering as well as broadening effect as the temperature increases.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Pourmand, Seyed Ebrahim
author_facet	Pourmand, Seyed Ebrahim
author_sort	Pourmand, Seyed Ebrahim
title	Spectroscopic properties of Nd : YAG laser pumped by flashlamp at various temperatures and input energies
title_short	Spectroscopic properties of Nd : YAG laser pumped by flashlamp at various temperatures and input energies
title_full	Spectroscopic properties of Nd : YAG laser pumped by flashlamp at various temperatures and input energies
title_fullStr	Spectroscopic properties of Nd : YAG laser pumped by flashlamp at various temperatures and input energies
title_full_unstemmed	Spectroscopic properties of Nd : YAG laser pumped by flashlamp at various temperatures and input energies
title_sort	spectroscopic properties of nd : yag laser pumped by flashlamp at various temperatures and input energies
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2013
url	http://eprints.utm.my/id/eprint/43968/5/SyedEbrahimPourmandPFS2013.pdf
_version_	1747817125390581760

Spectroscopic properties of Nd : YAG laser pumped by flashlamp at various temperatures and input energies

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