The model and output characteristics of intra-cavity pumped continuous-wave self-Raman three-wavelength lasers

摘要

In this paper, the scheme of intra-cavity pumped self-Raman continuous-wave lasers used to simultaneously output the quasi-three-level, four-level fundamental and first Stokes three-wavelength lasers is given, and a theoretical model based on this scheme is proposed. In this model, the plane wave approximation is employed, and the analytical expressions of the output power of three-wavelength lasers are derived. The impact of crystal length on the output characteristics of the Nd: YAG-Nd: YVO4 pair and Nd: YVO4-Nd: YVO4 pair are investigated by numerical simulation, and the focal length of the thermal lens is calculated. The comparison results show that the output characteristics of them are nearly identical, however, the thermal effect of the Nd: YAG-Nd: YVO4 pair is lower than that of the Nd: YVO4-Nd: YVO4 pair, so we can draw the conclusion that the Nd: YAG-Nd: YVO4 pair is slightly better than the Nd: YVO4-Nd: YVO4 pair.