Enhancement of nonlinear optical processes with a double-pass tight-focusing geometry
- 1 December 1978
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 33 (11), 928-930
- https://doi.org/10.1063/1.90221
Abstract
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.Keywords
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