Abstract

Frequency conversion of CO laser radiation was experimentally studied in ${\mathrm{ZnGeP}}_2$ and GaSe nonlinear crystals. To enhance conversion efficiency, we applied a CO laser system “master oscillator power amplifier” with concurrent mode locking and $Q$ switching. The laser system emitted $\sim 1$-μs train of ns pulses. Internal efficiency of frequency doubling reached 37% in ${\mathrm{ZnGeP}}_2$ crystal and 5% in GaSe crystal. Two-stage frequency conversion (including second-harmonic and difference-frequency generation) in ${\mathrm{ZnGeP}}_2$ crystal under optical pumping by a selective two-spectral line CO laser was studied.

© 2015 Optical Society of America

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