title: Maximization of second-harmonic power using normal-cut nonlinear crystals in a high-enhancement external cavity.
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 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.
authors.affiliation: Graduate School of Electronic Science and Engineering, Kyoto University, Katsura, Nishikyo, Kyoto 615-8510, Japan. onoda@giga.kuee.kyoto-u.ac.jp
authors.forename: Yugo
authors.initials: Y
authors.lastname: Onoda
authors.forename: Michihiko
authors.initials: M
authors.lastname: Ikeda
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Sugiyama
authors.forename: Haruhisa
authors.initials: H
authors.lastname: Yokoyama
authors.forename: Masao
authors.initials: M
authors.lastname: Kitano