Abstract
Four-wave sum and difference frequency generation of the outputs of two CO2 TEA lasers are demonstrated in liquid CO-O2 mixtures at 77 K. The efficiencies of these processes are enhanced by a two-photon resonance with the CO vibrational mode. A study of the polarization dependence and the line shape of the two-photon resonance is reported together with measurements of the mixing efficiencies. The difference frequency generation process can be phase matched using noncollinear phase matching.
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