Large-aperture YCOB crystal growth for frequency conversion in the high average power laser system

Physics – Condensed Matter – Materials Science

Scientific paper

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Growth From Melts, Zone Melting And Refining, Other Topics In Materials Science, Nonlinear Optical Crystals, Frequency Conversion, Harmonic Generation, Including Higher-Order Harmonic Generation

Scientific paper

Yttrium calcium oxyborate YCa4O(BO3)3 (YCOB) is a novel non-linear optical crystal possessing good thermal, mechanical and non-linear optical properties. Large-aperture YCOB crystals with 75 mm diameter were grown for high-average power frequency conversion on the mercury laser system. The growth morphology (included facet and spiral growth), cracking and inclusions in the as-grown crystal boule were discussed as the critical problem for large-aperture YCOB crystal growth. This can be minimized through modification of the growth program, including pulling rate, separation procedure, and cooling program. High-average power frequency conversion of the mercury laser using YCOB has been demonstrated, and experimental validation of YCOB material yields 50% conversion at 10 Hz has been achieved.

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