Abstract

A passively Q-switched dual-wavelength laser with coaxial diode end-pumping configuration is demonstrated. A theoretical model was built to simulate the dynamic process of dual-wavelength laser pulse generation. The experiment was performed with Nd:YVO4/Nd:GdVO4 composite laser crystals and a Cr4+:YAG absorber. The continuous-wave and Q-switched output power reached 3.48 W and 607 mW, respectively, under the maximum LD pump power of 8.0 W, corresponding to optical-to-optical conversion efficiencies of 43.5% and 7.6%. The power ratio between 1064.4 nm and 1063.5 nm could be tuned by varying the pump wavelength to balance the gains in two laser crystals.

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