Narrow-linewidth optical pulses at wavelengths near 630 nm with 2.2-mJ energy were generated with 61% efficiency in a periodically poled KTiOPO<sub>4</sub> parametric oscillator pumped by a frequency-doubled <i>Q</i> -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.
© 2001 Optical Society of America
V. Pasiskevicius, H. Karlsson, F. Laurell, R. Butkus, V. Smilgevicius, and A. Piskarskas, "High-efficiency parametric oscillation and spectral control in the red spectral region with periodically poled KTiOPO4," Opt. Lett. 26, 710-712 (2001)