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Cryogenically Cooled Yb:YAG Ceramic Amplifier Module for High Power Lasers Open Access


Other title
Laser Amplifier
High Power
Type of item
Degree grantor
University of Alberta
Author or creator
Masud, Muhammad R
Supervisor and department
Fedosejevs, Robert (Electrical and Computer Engineering)
Examining committee member and department
Ying, Tsui (Electrical and Computer Engineering)
Jaeger, Wolfgang (Chemistry)
Department of Electrical and Computer Engineering
Photonics and Plasmas
Date accepted
Graduation date
Master of Science
Degree level
A new class of direct diode pumped ceramic disk lasers are emerging as attractive candidates for efficient high power amplifiers in industrial and scientific applications. This thesis discusses the development and characterization of a high gain laser module based on Yb:YAG ceramic laser media which can be scaled to high power and high energy output for such applications. Measurements of gain and extracted energy have been carried out at room temperature as well as at cryogenic temperature. The results are then compared to rate equation modeling of the pulse amplification as a function of temperature and input pulse fluence. Temperature dependent cross-section values and the variation of lower level population according to Boltzmann distribution were considered in our calculations. The literature values of the cross-section and carrier lifetime that gave the best match with the experimental data are summarized in this work. The limitations in operating condition due to transverse/parasitic lasing were also explored and possible solutions were discussed. Based on the measurements and the simulations, a terawatt pulse system configuration is proposed.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
M. R. Masud, H. Tiedje, I. Utkin, and R. Fedosejevs, “Cryogenically Cooled Yb:YAG Ceramic Amplifier Modules for High Power Lasers,” Physics in Canada, vol. 71, issue 1, Masu 1- Masu3, 2015

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