Abstract

Frequency doubling of the radiation of selective and nonselective carbon monoxide lasers in nonlinear ZnGeP<sub>2</sub>and GaSe crystals has been experimentally investigated. An internal frequency-conversion efficiency as high as 7% has been obtained, with enrichment of the spectrum of the converted frequencies due to the parallel process of sum-frequency generation. The possibility is discussed of using the methods of nonlinear crystal optics to create a broad-range coherent-radiation source in the mid-IR and terahertz ranges of the spectrum, based on carbon monoxide lasers.

© 2011 OSA

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