1120 nm second-Stokes generation in KTiOAsO4

The efficient second-Stokes generation at 1120 nm is obtained from a KTIOAsO4 (KTA) crystal. The relative Raman scattering cross sections of KTA with respect to YVO4 are determiend by studying their spontaneous Raman scattering spectra at room temperature. A 30-mm-long KTA crystal is placed inside the cavity of a diode-end-pumped acousto-optically Q-switched Nd:YAG laser. With a pump power of 6.7 W and a pulse repetition rate of 20 kHz, the second-Stokes (1120 nm) power of 0.63 W is obtained, corresponding to a diode-to-second-Stokes conversion efficiency of 9.4%. (c) 2009 by Astro Ltd. Published exclusively by WLLEY-VCH Verlag GmbH & Co. KGaA