Abstract

This paper describes a picosecond laser system based on a hybrid CO₂ laser, using optically controlled semiconductor switches with a pulse width from 100 ps to 300 ns, followed by conversion of the radiation in nonlinear crystals by means of second-harmonic generation. Silver selenogallate AgGaSe₂ and zinc germanium diphosphide ZnGeP₂ are used as nonlinear crystals. Two-stage conversion of the radiation of a picosecond CO₂ laser with wavelength 9.4-10.6 μm into laser radiation with wavelengths 4.7-5.3 μm is carried out in the apparatus with an efficiency of 0.3%-0.5%, while 4.7-5.3-μm radiation is converted into 2.4-2.65-μm radiation with an efficiency of 8%. The overall conversion efficiency is 4×10⁻⁴ or 0.04% for an output pulse energy up to 35 μJ.

© 2009 Optical Society of America

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