Analysis of frequency dependent pump light absorption

Matthias Wohlmuth; Christoph Pflaum

doi:10.1117/12.874793

7 February 2011 Analysis of frequency dependent pump light absorption

Matthias Wohlmuth, Christoph Pflaum

Proceedings Volume 7913, Laser Resonators and Beam Control XIII; 791303 (2011) https://doi.org/10.1117/12.874793
Event: SPIE LASE, 2011, San Francisco, California, United States

Abstract

Simulations have to accurately model thermal lensing in order to help improving resonator design of diode pumped solid state lasers. To this end, a precise description of the pump light absorption is an important prerequisite. In this paper, we discuss the frequency dependency of the pump light absorption in the laser crystal and its influence on the simulated laser performance. The results show that the pump light absorption has to include the spectral overlap of the emitting pump source and the absorbing laser material. This information can either be used for a fully frequency dependent absorption model or, at least in the shown examples, to compute an effective value for an exponential Beer-Lambert law of absorption. This is particularly significant at pump wavelengths coinciding with a peak of absorption. Consequences for laser stability and performance are analyzed for different pump wavelengths in a Nd:YAG laser.

Citation Download Citation

Matthias Wohlmuth and Christoph Pflaum "Analysis of frequency dependent pump light absorption", Proc. SPIE 7913, Laser Resonators and Beam Control XIII, 791303 (7 February 2011); https://doi.org/10.1117/12.874793

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