Recent progress in yellow laser: Principles, status and perspectives

Yellow lasers have always attracted much attention in the fields of biomedicine, lidar, adaptive optics and nano-guide stars. Different application scenarios also have differences in the selection of yellow light wavelengths and various indicators. For example, the Coarse Star and Nano-guide technologies require a narrow yellow light linewidth of 589 nm. According to the generation method, it can be divided into dye excitation, semiconductor excitation and nonlinear frequency conversion excitation. Non-linear frequency conversion technology can be divided into sum frequency generation (SFG), second harmonic generation (SHG), optical parametric oscillation (OPO) and stimulated Raman scattering (SRS). Among them, SRS has become a current research hotspot due to its high beam quality, high wavelength scalability and high conversion efficiency. The development and research status of non-linear frequency conversion technology are expatiated in this article, which is useful reference for the future in this field.