Integrated intracavity quasi-phase-matched second harmonic generation based on periodically poled Nd:LiTaO3

Abstract
Integrated intracavity quasi-phase-matched second harmonic generation (QPM-SHG) has been demonstrated in a periodically domain inverted Nd:LiTaO 3 crystal which functions simultaneously as a gain and nonlinear medium. Lasing at 1.082 μm and simultaneous QPM-SHG at 541 nm has been established by pumping near 806 nm. The effect of doping on the domain reversal voltage of LiTaO 3 and the photorefractive effect have also been investigated. It is found that optical damage can be avoided by heating above 80 °C.