Continuous-wave 560Â nm light generated by intracavity SrWO4 Raman and KTP sum-frequency mixing

An LD end-pumped Nd:YAG/SrWO4 continuous-wave 560 nm laser is presented based on intracavity sum-frequency mixing of the fundamental and first-Strokes light. The maximum output power of 330 mW at 559.6 nm was obtained for the diode pump power of 13.7 W and the conversion efficiency was about 2.5%. The intense blue emission was also observed in the SrWO4 crystal when the Raman laser was operating above threshold. This blue emission is centered at 473 nm, which also happened to YVO4.