Abstract
The work is devoted to the study of the second-harmonic generation (SHG) process as a result of random quasi-phase-matching of thulium laser radiation in ZnSe polycrystals. A linear dependence of the SHG efficiency on the nonlinear medium length has been observed in the experiment. The efficiencies of SHG in ZnSe polycrystals with average grain sizes from 35[Formula: see text][Formula: see text]m to 380[Formula: see text][Formula: see text]m were compared. The obtained results are in good agreement with the theory in the case of a Gaussian grain size distribution.
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