Abstract
We have achieved 150 mW of cw output at , using difference frequency mixing in a singly resonant optical parametric oscillator (OPO). We pumped the OPO cavity, which contains periodically poled (PPLN), with a 14-W Nd:YAG laser to generate a signal at and an idler at . Mixing of the two waves at the same crystal temperature and grating spacing yielded emission in the mid IR. This technique avoids the mid-IR absorption–high-threshold problem, which has limited the cw performance of PPLN OPO’s at wavelengths beyond . Provided that tunability is not required, this method is a simple alternative to multiple-crystal configurations.
© 2001 Optical Society of America
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