Abstract
Broadband sum-frequency conversion of multiline Q-switched CO laser emission in a single uncoated ZnGeP2 crystal was experimentally studied by application of single-pass and double-pass optical schemes. The laser emitted sub-microsecond pulses of 4 kW peak power at 100 Hz pulse repetition rate on ∼60 spectral lines within ∼5–6 μm wavelength interval. The sum-frequency emission spectrum consisted of at least ∼100 spectral lines covering the wavelength interval of ∼2.5–2.9 μm. The double-pass scheme provided about 30% higher efficiency as compared to a traditional single-pass one, while the spectral bandwidth of frequency converted radiation was the same. Moreover, a feasibility of slight spectral bandwidth extension by a variation of a reverse beam direction was demonstrated for the double-pass scheme.
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