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Highly efficient 1.3-microm second-stokes PbWO4 Raman laser.

A second-Stokes Raman laser based on PbWO4 with a 1.316-microm wavelength pumped by an approximately 120-ps Nd:YAG laser at 1.06415 microm scattered at 901 cm(-1) phonon was developed. High-reflection mirrors for the Stokes wavelength were used. The maximum output energy was 0.85 mJ. The conversion efficiency increased with crystal length of 40-100 mm up to 30%. The spatial beam profile was smooth, and the Raman laser emission lasted for approximately 18 ns. New stimulated Raman scattering lines from a phonon at 323 cm(-1) were observed.