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 $\beta \text{-}{\mathrm{BaB}}_2{\mathrm{O}}_4$ crystal of at most $3\mathrm{K}$ is sufficient to realize constructive interference at any wavelength. We achieve an enhancement factor of 125, and a second-harmonic power of $125\mathrm{mW}$ is generated at $398\mathrm{nm}$ from a fundamental power of $390\mathrm{mW}$ .

© 2009 Optical Society of America

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