Samanta G K, Kumar S Chaitanya, Mathew M, Canalias C, Pasiskevicius V, Laurell F, Ebrahim-Zadeh M
ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, Castelldefels, Barcelona, Spain.
Opt Lett. 2008 Dec 15;33(24):2955-7. doi: 10.1364/ol.33.002955.
We report efficient generation of high-power, cw, single-frequency radiation in the green in a simple, compact configuration based on single-pass, second-harmonic generation of a cw ytterbium fiber laser at 1064 nm in periodically poled KTiOPO(4). Using a crystal containing a 17 mm single grating with period of 9.01 microm, we generate 6.2 W of cw radiation at 532 nm for a fundamental power of 29.75 W at a single-pass conversion efficiency of 20.8%. Over the entire range of pump powers, the generated green output is single frequency with a linewidth of 8.5 MHz and has a TEM(00) spatial profile with M(2)<1.34. The demonstrated green power can be further improved by proper thermal management of crystal heating effects at higher pump powers and also by optimized design of the grating period to include thermal issues.
我们报告了一种基于在周期极化磷酸钛氧钾（KTiOPO₄）中对1064 nm连续波镱光纤激光器进行单程二次谐波产生的简单紧凑配置，高效产生绿色高功率连续波单频辐射的方法。使用一个包含17 mm单光栅、周期为9.01微米的晶体，我们在532 nm处产生了6.2 W的连续波辐射，基频功率为29.75 W，单程转换效率为20.8%。在整个泵浦功率范围内，产生的绿色输出为单频，线宽为8.5 MHz，具有TEM(00)空间分布，M²<1.34。通过在更高泵浦功率下对晶体热效应进行适当的热管理，以及通过优化光栅周期设计以考虑热问题，所展示的绿色功率可以进一步提高。
