Abstract
To expand the possibilities of spectroscopic systems based on a CO2 laser, we have mixed the frequencies of its radiation with the radiation of erbium lasers. Simultaneous use of Er3+:CaF2 (λ = 2.76 μm) and Er3+:YAG lasers (λ = 2.96 μm) makes it possible for the spectrum of generated sum and difference frequencies to overlap the ranges 2.2–2.3 and 3.6–4.3 μm that coincide with the atmospheric transparency windows. Generation of the difference frequencies of radiation of erbium lasers and of the 10.6-μm radiation of a CO2 laser were observed in CdSe at a phase-matching angle of 72°40′. In a bleached CdSe crystal of length 40 mm the efficiency of transformation has attained 12%. To sum up the frequencies, 4.5-mm ZnGeP2 crystals were used, with the efficiency of transformation being 3% and the phase-matching angle being equal to 52°.
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