Intracavity frequency doubling with a Yb:YAG/LBO laser at 515 nm

Abstract

We, for the first time, report the intracavity frequency doubling at 1030 nm in an LBO nonlinear optical crystal, at a type-I phase-matching direction of (θ, Φ) = (90°, 13.6°), performed with a double-LD polarization coupled system. With an incident power of 2 W, the maximum output power of 5.62 mW at 515 nm was obtained using a 2 × 2 × 10 mm3 LBO crystal. The threshold was 726 mW. The optical conversion efficiency was 0.28%.