INTRACAVITY 2ND-HARMONIC GENERATION WITH A PERIODICALLY DOMAIN-INVERTED LITAO3 DEVICE

Efficient intracavity second-harmonic generation (SHG) based on a bulk -type quasi-phase-matched (QPM) SHG device in a LiTaO3 crystal is demo nstrated. The periodically domain-inverted regions were fabricated by a high-voltage application technique. The internal loss from the refra ctive-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 e ffected to generate 13-mW green light for a pump power of 130 mW witho ut suffering transverse mode distortion from a photorefractive effect. (C) 1996 Optical Society of America