We have observed two-photon resonantly enhanced tripling of CO₂-laser radiation in liquid CO mixtures. Using a tight-focusing geometry, a power conversion efficiency of 0.3% for the CO₂ $R(6)$ line at 1069.01 cm^-1 has been achieved for a CO-O₂ solution. The solvent dependence of the CO two-photon resonance has been studied. Phasematching with an additional molecular constituent has been demonstrated.
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Kildal et al. (1977) studied this question.
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