Quasi-phase-matched self-frequency-doubling waveguide laser in Nd :: LiNbO3

A Nd:LiNbO3 quasi-phase-matched self-frequency-doubling waveguide laser is demonstrated for the first time. Fabrication of domain-inverted gratings in Nd:LiNbO3 for quasi-phase-matched second-harmonic generation (QPM-SHG) was a key for implementation of the device, A simple fabrication method was fo und and employed in a prototype device fabrication, The device was opticall y-pumped at 814-nm wavelength. A laser oscillation took place at 1084 nm an d green light emission was obtained at 542 nm by intracavity QPM-SHG.