Abstract

We have demonstrated a simple, high-energy, narrow spectral bandwidth optical parametric oscillator (OPO) by use of a large aperture periodically poled Mg-doped LiNbO3 device with a volume Bragg grating (VBG). A free-running degenerate OPO pumped by a Q-switched 1.064μm Nd:YAG laser exhibits maximum output pulse energy of 110mJ with high slope efficiency of 75% around room temperature. Broad spectral bandwidth (Δλ100nm) around the degeneracy wavelength was suppressed by using a VBG as an output coupler. Up to 61mJ of the output pulse energy with narrowed spectral bandwidth of less than 1.4nm was obtained at the degeneracy wavelength of 2.128μm.

© 2007 Optical Society of America

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