Abstract

Nowadays second harmonic generation (SHG) is widely used for generation of laser radiation at multiple frequencies in visible spectral range. In most cases SHG efficiency strongly depends on nonlinear-optical crystal temperature due to the coherent nature of the process. Thus temperature control of the crystal is crucial factor in SHG process. It is obvious that absorption of pump and generated photons results in substantially nonuniform temperature distribution inside crystal, especially in longitudinal direction along laser beam propagation. As follows correct measurement, which is a great challenge, and calculation of crystal longitudinal temperature distribution during SHG is very important [1]. Theoretical model suggests finding temperature distribution of nonlinear-optical crystal by solving coupled equations of SHG and heat conduction equation with a heat source, represented by absorption of the first and second harmonic energy.

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