Single longitudinal mode (SLM) operation of a 620 nm diamond Raman laser is demonstrated in a standing-wave cavity that includes a second-harmonic generation element. Mode competition provided by the harmonic mixing is shown to greatly increase mode stability, in addition to the benefits of the spatial-hole-burning-free gain medium. Using a multi-longitudinal mode 1064 nm Nd:YAG pump laser of power 321 W and linewidth 3.3 GHz, SLM powers of 38 W at 620 nm and 11.8 W at 1240 nm were obtained. The results indicate that simple standing-wave oscillators pumped by multimode Yb or Nd pumps compose a promising practical route towards the generation of high-power SLM beams in the yellow–red part of the spectrum.

中文翻译：

---

高功率单频620 nm金刚石激光器，通过谐波自抑制和无空洞燃烧增益得到稳定

在包含第二谐波产生元件的驻波腔中演示了620 nm金刚石拉曼激光器的单纵模（SLM）操作。除无空间烧孔的增益介质的优点外，谐波混频提供的模式竞争被证明可以大大提高模式稳定性。使用功率为321 W，线宽为3.3 GHz的多纵模1064 nm Nd：YAG泵浦激光器，可以获得620 nm处38 W和1240 nm处11.8 W的SLM功率。结果表明，由多模Yb或Nd泵浦泵浦的简单驻波振荡器构成了一条有希望的实用途径，可用于在光谱的黄红色部分生成高功率SLM光束。