We report a watt-level yellow random laser at 589 nm. The laser is generated by single-pass second harmonic generation of a half-open random Raman fiber laser at 1178 nm in a periodically poled stoichiometric lithium tantalite crystal. The major limitation on power scaling is the usual broad linewidth of random Raman fiber lasers. By counter pumping instead of common co-pumping, and using narrower fiber Bragg grating as the single mirror, the output spectrum of the 1178 nm random laser is greatly narrowed. As a result, up to 1.09 W 589 nm laser is obtained from a 10.1 W fundamental power with a conversion efficiency of 10.8%. The power and conversion efficiency are significantly improved compared to the previous report on frequency doubling of random Raman fiber laser.

我们报告了589 nm的瓦特级黄色随机激光。激光是通过在周期性极化的化学计量的钽酸钽晶体中在1178 nm处半开随机拉曼光纤激光器的单次二次谐波生成而生成的。功率缩放的主要限制是随机拉曼光纤激光器通常较宽的线宽。通过反向泵浦而不是普通的共泵浦，并使用较窄的光纤布拉格光栅作为单反射镜，极大地缩小了1178 nm随机激光器的输出光谱。结果，从10.1 W的基本功率获得了高达1.09 W的589 nm激光器，转换效率为10.8％。与先前有关随机拉曼光纤激光器倍频的报告相比，功率和转换效率得到了显着提高。