Analytical solution of the transient temperature profile in gain medium of passively Q-switched microchip laser

The transient temperature evolution in the gain medium of a continuous wave (CW) end-pumped passively Q-switched microchip (PQSM) laser is analyzed. By approximating the time-dependent population inversion density as a sawtooth function of time and treating the time-dependent pump absorption of a CW...

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Bibliographic Details
Published in:Applied optics (2004) 2014-11, Vol.53 (31), p.7540-7550
Main Authors: Han, Xiahui, Li, Jianlang
Format: Article
Language:English
Subjects:
Approximation
Continuous wave
Density
Evolution
Exact solutions
Gain
Lasers
Mathematical analysis
Pumps
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Summary:The transient temperature evolution in the gain medium of a continuous wave (CW) end-pumped passively Q-switched microchip (PQSM) laser is analyzed. By approximating the time-dependent population inversion density as a sawtooth function of time and treating the time-dependent pump absorption of a CW end-pumped PQSM laser as the superposition of an infinite series of short pumping pulses, the analytical expressions of transient temperature evolution and distribution in the gain medium for four- and three-level laser systems, respectively, are given. These analytical solutions are applied to evaluate the transient temperature evolution and distribution in the gain medium of CW end-pumped PQSM Nd:YAG and Yb:YAG lasers.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.53.007540