Modeling of energy-transfer upconversion and thermal effects in end-pumped quasi-three-level lasers

Applied Optics
Stefan Bjurshagen, Ralf Koch

Abstract

An analytical model of cw quasi-three-level lasers that includes the influence of energy-transfer upconversion (ETU) has been developed. The results of the general output modeling were applied to a laser with Gaussian beams, and rigorous numerical calculations have been made to study the influence of ETU on threshold, output power, spatial distribution of population-inversion density, and fractional thermal loading. The model was applied to a laser operating at 946 nm in Nd:YAG, where the dependence of laser-beam size on laser performance was investigated in particular. A simple model for the degradation of laser-beam quality from a transversally varying saturated gain is proposed that is in good agreement with measurements of the laser in a plane-plane cavity.

Citations

Jan 1, 2017·Applied Physics. B, Lasers and Optics·L Cini, J I Mackenzie

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