The first use of a double-pass geometry to enhance the conversion efficiency of a parametric nonlinear process in the tight-focusing limit is reported. For third-harmonic generation in liquid–CO-O2 mixtures using a CO2 laser pump source, the observed enhancement is 2.5; elimination of reflection losses will result in an enhancement of 4. The double-pass geometry has also been used to obtain accurate measurements of the wave-vector mismatch Δk of the nonlinear medium.
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Brueck et al. (1978) studied this question.
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