Abstract
The results are given of an experimental investigation of the influence of thermal self-interactions on the second-harmonic generation in KDP, ADP (90% phase matching), and Ag3AsS3 (~22? phase-matching angle) crystals. The cause of the fall of the second-harmonic power was determined. It was found that at pumping powers exceeding a critical value characteristic of a given crystal the conversion efficiency fell because of the induced thermal detuning of the phase matching. The influence of birefringence was also considered.
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