We have demonstrated a simple, high-energy, narrow spectral bandwidth optical parametric oscillator (OPO) by use of a large aperture periodically poled Mg-doped device with a volume Bragg grating (VBG). A free-running degenerate OPO pumped by a Q-switched Nd:YAG laser exhibits maximum output pulse energy of with high slope efficiency of 75% around room temperature. Broad spectral bandwidth around the degeneracy wavelength was suppressed by using a VBG as an output coupler. Up to of the output pulse energy with narrowed spectral bandwidth of less than was obtained at the degeneracy wavelength of .
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