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Maximization of second-harmonic power using normal-cut nonlinear crystals in a high-enhancement external cavity

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Abstract

When an antireflection-coated normal-cut nonlinear crystal is used in an external cavity for the generation of high second-harmonic power, a small residual reflection at the crystal facets causes a round-trip loss and prevents the realization of a large fundamental enhancement. This problem is eliminated when the reflected beams at the crystal facets are subject to constructive interference. We demonstrate that the temperature tuning of a β-BaB2O4 crystal of at most 3K is sufficient to realize constructive interference at any wavelength. We achieve an enhancement factor of 125, and a second-harmonic power of 125mW is generated at 398nm from a fundamental power of 390mW.

© 2009 Optical Society of America

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