High-efficiency parametric oscillation and spectral control in the red spectral region with periodically poled KTiOPO4

• Narrow-linewidth optical pulses at wavelengths near 630 nm with 2.2-mJ energy were generated with 61% efficiency in a periodically paled KTiOPO4 parametric oscillator pumped by a frequency-doubled Q-switched Nd:YAG laser. The tuning range was extended to 30 nm by a noncollinear elliptical pumping geometry. We demonstrate that by angular dispersion a noncollinear optical parametric oscillator can be used to control the spectral and spatial characteristics of the output signal beam.

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