Fourth harmonic conversion of 1.06u in BBO and KD*P

Steven C. Matthews; James S. Sorce

doi:10.1117/12.18316

1 May 1990 Fourth harmonic conversion of 1.06_u in BBO and KD*P

Steven C. Matthews, James S. Sorce

Proceedings Volume 1220, Nonlinear Optics; (1990) https://doi.org/10.1117/12.18316
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

Fourth harmonic generation in BBO and KD*P was investigated using a phase-conjugated Nd:YAG amplifier as a pump source. The 1.1J, 1.06i source was converted to 0.55J @ 0.53j.t as the pump source for the investigation. Energy outputs of 250mJ at 0.27ji. were obtained. Control of the angular dephasing error was found to be critical for good conversion efficiency, particularly in BBO. We measured internal conversion efficiencies of 70% with the 12.7X12.7X2Omm KJYP crystal, and 58% with the 1OX1OX4.6mm BBO. Analysis correlated well with the experimental results in the case of KD*P, but implied a higher nonlinear coefficient for BBO than is reported in the literature. An energy imbalance of 15% due to nonlinear absorption was observed for both crystals when they were tuned for optimum 0.27p. generation. This was found to cause rapid thermal dephasing during 10-20Hz operation. We conclude that, using either of these materials, careful thermal management is necessary in obtaining efficient fourth harmonic conversion for higher average power operation.

Citation Download Citation

Steven C. Matthews and James S. Sorce "Fourth harmonic conversion of 1.06_u in BBO and KD*P", Proc. SPIE 1220, Nonlinear Optics, (1 May 1990); https://doi.org/10.1117/12.18316

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