Integrated intracavity quasi-phase-matched second harmonic generation (QPM-SHG) has been demonstrated in a periodically domain invertedNd:LiTaO3crystal which functions simultaneously as a gain and nonlinear medium. Lasing at 1.082 &mgr;m and simultaneous QPM-SHG at 541 nm has been established by pumping near 806 nm. The effect of doping on the domain reversal voltage ofLiTaO3and the photorefractive effect have also been investigated. It is found that optical damage can be avoided by heating above 80 °C. ©1997 American Institute of Physics.