Quasi-cw high-power lithium iodate Raman laser for the optical range

A lithium iodate crystal, placed inside the resonator of a continuously pumped YAG:Nd³⁺ laser, was used to achieve for the first time stimulated Raman scattering (STRS) generating wavelengths 556.46 and 582.99 nm with an average power in the mode-locking regime of about 50 mW and 7 mW, respectively. In the Q-switching regime at the 582.99 nm wavelength the average power was 320 mW in one direction. It was also found experimentally that weak radiation of wavelengths 509.78 and 612.33 nm was emitted. The conditions for the observation of these effects were analyzed. The wavelengths of the observed radiation were attributed to STRS of the fundamental-frequency radiation accompanied by simultaneous generation of the second harmonic, and also of sum frequencies in the lithium iodate crystal.