Efficient intracavity second-harmonic generation (SHG) based on a bulk-type quasi-phase-matched (QPM) SHG device in a LiTaO3 crystal is demonstrated. The periodically domain-inverted regions were fabricated by a high-voltage application technique. The internal loss from the refractive-index change in the domain-inverted regions was reduced to less than 0.1% by an annealing technique. Intracavity frequency doubling of a Nd:YVO4 laser with the QPM SHG device pumped by a laser diode was effected to generate 13-mW green light for a pump power of 130 mW without suffering transverse mode distortion from a photorefractive effect.
© 1996 Optical Society of America
Yasuo Kitaoka, Kiminori Mizuuchi, Kazuhisa Yamamoto, Makoto Kato, and Takatomo Sasaki, "Intracavity second-harmonic generation with a periodically domain-inverted LiTaO3 device," Opt. Lett. 21, 1972-1974 (1996)