K<sub>2</sub>Al<sub>2</sub>B<sub>2</sub>O<sub>7</sub> has been found to be phase matchable for type-1 sum-frequency generation (SFG) at 0.193 μm by mixing the Nd:YAG laser wavelength at 1.0642 μm and the SFG output of the RbTiOAsO<sub>4</sub> optical parametric oscillator tuned at 0.2358 μm. An average power of 200 mW at 10 kHz was obtained in a 7-mm-long crystal. In addition, the Sellmeier equations and the thermo-optic dispersion formula, which predict well the phase-matching conditions and temperature phase-matching bandwidths (FWHM) for second-harmonic generation and SFG in the 0.193–0.669-μm range, are presented.
© 2003 Optical Society of America
(140.7300) Lasers and laser optics : Visible lasers
(160.4330) Materials : Nonlinear optical materials
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4400) Nonlinear optics : Nonlinear optics, materials
Nobuhiro Umemura, Miwako Ando, Kaori Suzuki, Eiko Takaoka, Kiyoshi Kato, Zhang-Gui Hu, Masashi Yoshimura, Yusuke Mori, and Takatomo Sasaki, "200-mW-Average Power Ultraviolet Generation at 0.193 μm in K2Al2B2O7," Appl. Opt. 42, 2716-2719 (2003)