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The continuous wave (CW) and passively Qswitched Nd:Gd3AlxGa5−xO12 (Nd:GAGG) laser operation at 938 nm have been realized for the first time. The maximum CW output power of 0.44 W was obtained under the absorbed pump power of 8.54 W, corresponding to the slope efficiency of 7.8% and optical-to-optical efficiency of 5.2% respectively. A V 3+ :YAG saturable absorber crystal with the initial transmission of 97% was used for the passive Q-switching regime. The maximum average output power of 0.19 W was achieved with the minimum pulse width of 358 ns and Q-switched repetition rate of 116 kHz. The corresponding single pulse energy and pulse peak power were determined to be 1.6 μJ and 4.6 W, respectively.

Abstract:We report an intracavity optical parametric oscillator at 1.57 µm based on non-critically nonlinear crystal KTP driven by an end-pumped acousto-optically Q-switched Nd:LuVO 4 crystal. The output characteristics of 1.57 µm were studied with different pulse repetition frequency. The pulse width of 5ns, the maximum peak power and pulse energy of 4.8 kW and 24 µJ were obtained, respectively, with pulse repetition frequency of 5 kHz. The compression ration of pulse width was six times for 1.06 µm to 1.57 µm.