Abstract

For the first time, to the best of our knowledge, a broadband two-stage frequency conversion of multiline CO laser radiation was theoretically and experimentally demonstrated in a single ${\mathrm{AgGaSe}}_2$ crystal. The first stage is sum frequency generation of CO laser radiation. The second stage is concurrent difference frequency generation within 4.3–4.9 μm spectral range when mixing sum frequency radiation with the pump radiation in the same ${\mathrm{AgGaSe}}_2$ crystal. Internal sum frequency generation efficiency of multiline CO laser was up to 1%, while internal difference frequency generation efficiency was up to 0.065%.

© 2016 Optical Society of America

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