title: Continuous-wave, double-pass second-harmonic generation with 60% efficiency in a single MgO:PPSLT crystal.
abstract: We present a double-pass scheme for high-efficiency, high-power, second-harmonic generation (SHG) in a single MgO-doped periodically poled stoichiometric lithium tantalate (MgO:PPSLT) crystal. The device is pumped by a single-frequency, continuous-wave fiber amplifier laser system at a wavelength of 1091 nm. For the double-pass scheme, a conversion efficiency of 60% and a harmonic power of 12.8 W at a wavelength of 545.5 nm with a high beam quality of (M2<1.2) is achieved. Compared to single-pass SHG, a double-pass enhancement factor of more than two is observed at the highest fundamental pump power.
authors: Matthias
authors: M
authors: Stappel
authors: Daniel
authors: D
authors: Kolbe
authors: Jochen
authors: J
authors: Walz