We report a demonstration of distributed-feedback (DFB) optical parametric oscillation (OPO) by writing photorefractive gratings in periodically poled lithium niobate (PPLN). The photorefractive DFB structures were fabricated by illumination of PPLN with UV light through a photomask and by writing of PPLN with UV-light gated interfering laser beams at 532 nm. Evidence of OPO was observed from the spectral narrowing at the 1438.8- and the 619.3-nm signal wavelengths from 1064- and 532-nm-pumped PPLN crystals with the DFB grating periods phase matched to the 4084.5- and 3774-nm idler wavelengths, respectively.
© 2002 Optical Society of America
(140.3490) Lasers and laser optics : Lasers, distributed-feedback
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(190.5330) Nonlinear optics : Photorefractive optics
A. C. Chiang, Y. Y. Lin, T. D. Wang, Y. C. Huang, and J. T. Shy, "Distributed-feedback optical parametric oscillation by use of a photorefractive grating in periodically poled lithium niobate," Opt. Lett. 27, 1815-1817 (2002)