Development of the technology of nonlinear optical ZnGeP2 crystals and laser radiation frequency converters for atmospheric gas analysis systems
P.P. Geiko1,2, A.I. Gribenyukov1
1Institute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
2National Research Tomsk State University, Tomsk, Russia
Keywords: nonlinear optical crystals, defects, absorption coefficient, frequency conversion, phase matching, gas analysis
Abstract
The results of long-term research on the optimization of technological processes for obtaining crystals with high optical quality that meets the requirements of mass production of nonlinear optical elements are presented. The physical nature of the defects that determine the optical losses of nonlinear optical ZnGeP2 crystals is clarified. Methods and modes of effective post-post processing of single crystals that provide an increase in optical quality are proposed. Precision thermal equipment has been developed for the synthesis of multicomponent compounds and the growth of crystals with controlled properties. The conducted research cycle allowed us to obtain crystals with record absorption coefficients and breakdown thresholds. The dispersion properties of single crystals are investigated. The conditions for phase matching and conversion efficiency of laser pulses of various durations and wavelengths are calculated. Based on the calculations performed, nonlinear optical elements were manufactured, which were used in numerous experiments on the conversion of the frequency of laser radiation. The results of some experiments on frequency conversion in ZnGeP2 crystals, which were also used in atmospheric trace gas analysis systems, are briefly presented.
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