Abstract

The third harmonic of CO₂-laser radiation has been obtained by passing the laser beam through two CdGeAs₂ crystals in tandem, with the first crystal oriented for second-harmonic generation and the second for sum mixing. Using this technique, we have achieved an average external conversion efficiency of 1.5%, corresponding to an average internal conversion efficiency of 3% and peak-power efficiency near 6%. A brief comparison with other methods of generating the third harmonic of CO₂-laser radiation is given.

© 1979 Optical Society of America

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