Efficient near-infrared, multiwavelengths PbWO4 Raman laser

We report on a near-infrared, multiwavelength-stimulated Raman scattering (SRS) laser source based on the PbWO4 crystal, pumped by a pico-second Nd:YAG laser. At a high pump level, simultaneous two phonon modes SRSs are obtained, including 901 and 323 cm−1 Raman shifts, presenting six Raman spectral lines distributing in 1- to 1.5-μm waveband. The largest Raman output energy is 0.72 mJ, corresponding to an optical conversion efficiency of 37.9% and a slope efficiency of 80.4%. This work manifests that, as a low cost, large size, and high damage threshold crystal, PbWO4 is an efficient, convenient SRS material to enrich near-infrared laser wavelengths.