Stimulated Raman-scattering-based lasers provide an effective way to achieve wavelength conversion. However, thermally induced beam degradation is a notorious obstacle to power scaling and it also limits the applicable range where high output beam quality is needed. Considerable research efforts have been devoted to developing Raman materials, with diamond being a promising candidate to acquire wavelength-versatile, high-power, and high-quality output beam owing to its excellent thermal properties, high Raman gain coefficient, and wide transmission range. The diamond Raman resonator is usually designed as an external-cavity pumped structure, which can easily eliminate the negative thermal effects of intracavity laser crystals. Diamond Raman converters also provide an approach to improve the beam quality owing to the Raman cleanup effect. This review outlines the research status of diamond Raman lasers, including beam quality optimization, Raman conversion, thermal effects, and prospects for future development directions.

中文翻译：

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金刚石拉曼激光器：一种很有前途的高光束质量和低热效应激光器

受激拉曼散射激光器提供了一种实现波长转换的有效方法。然而，热致光束退化是功率缩放的一个臭名昭著的障碍，它还限制了需要高输出光束质量的适用范围。大量研究工作致力于开发拉曼材料，金刚石因其优异的热性能、高拉曼增益系数和宽传输范围而成为获得波长通用、高功率和高质量输出光束的有希望的候选者。金刚石拉曼谐振器通常设计为外腔泵浦结构，可以轻松消除腔内激光晶体的负热效应。由于拉曼净化效应，金刚石拉曼转换器还提供了一种改善光束质量的方法。