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A diode‐pumped Q‐switched ceramic Nd:YAG laser operating at 946 nm has been demonstrated in our experiment for the first time. When using a fiber‐coupled laser diode with a fiber diameter of 600 μ m as the pump source, an average output power of 2.64Wat a repetition rate of 50 kHz was obtained when the incident pump power was 17.39 W. When the fiber diameter was 400 μ m, with an incident pump power of 11.56 W, an average output power of 1.79 W was achieved at a repetition rate of 50 kHz, corresponding to an optical conversion efficiency of 15.5%. The maximum pulse energy of 120.89 μ J and the minimum pulse width of 56 ns were obtained at a repetition rate of 10 kHz. The laser results of the Q‐switched ceramic laser material was comparable to the best values obtained in 946 nm Qswitched crystal Nd:YAG lasers. (© 2009 by Astro Ltd., Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA)

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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 determined 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%.

Abstract:A diode-side-pumped actively Q-switched Nd:YAG/SrWO4 intracavity Raman laser has been demonstrated, in which a Nd:YAG module is used as the fundamental laser source and a SrWO 4 crystal is used as the Raman active medium to generate first-Stokes laser at 1180 nm. A convexplane cavity is employed to make the laser in a stable and efficient work under high pump power. At a LD pump power of 164 W and a pulse repetition frequency of 20 kHz, an average output power of 10.5 W at 1180 nm is obtained.Typical oscilloscope traces for the fundamental and Raman pulses