Maximization of second-harmonic power using normal-cut nonlinear crystals in a high-enhancement external cavity.
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-BaB(2)O(4) crystal of at most 3 K is sufficient to realize constructive interference at any wavelength. We achieve an enhancement factor of 125, and a second-harmonic power of 125 mW is generated at 398 nm from a fundamental power of 390 mW.
Onoda
Yugo
Y
Graduate School of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo, Kyoto 615-8510, Japan. onoda@giga.kuee.kyoto-u.ac.jp
Ikeda
Michihiko
M
Sugiyama
Kazuhiko
K
Yokoyama
Haruhisa
H
Kitano
Masao
M