Research Progress on Wavelength Modulation Technologies of Crystalline Raman Lasers

Wavelength‐versatile laser systems play a critical role in the fields of spectroscopy, biomedical, light detection and ranging (LIDAR), precision measurement, and nonlinear frequency conversion. Among the various techniques for realizing this wavelength versatility, crystalline Raman lasers have emerged as a prominent solution. Such scheme overcomes inherent limitations of conventional techniques, including strict phase‐matching and spatial hole burning, while offering additional benefits such as beam purification and pulse compression, making them an ideal platform for realizing wavelength‐versatile lasers. This article provides a systematic review of the wavelength‐versatile crystalline Raman lasers, detailing their operational mechanisms and technological progress in four types of wavelength operation: wavelength‐tunable, wavelength‐switchable, dual‐wavelength, and multi‐wavelength. Finally, future development trends are also discussed to offer theoretical references for wavelength‐versatile crystalline Raman lasers.