Stappel Matthias, Kolbe Daniel, Walz Jochen
Opt Lett. 2014 May 15;39(10):2951-4. doi: 10.1364/OL.39.002951.
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.
我们提出了一种双程方案，用于在单个掺氧化镁的周期性极化化学计量比钽酸锂（MgO:PPSLT）晶体中实现高效、高功率二次谐波产生（SHG）。该装置由波长为1091 nm的单频连续波光纤放大器激光系统泵浦。对于双程方案，在波长545.5 nm处实现了60%的转换效率和12.8 W的谐波功率，光束质量高（M2<1.2）。与单程SHG相比，在最高基频泵浦功率下观察到双程增强因子超过两倍。
