Cw-Intracavity Frequency Doubling With Different Crystals

The cw second-harmonic generation (SHG) properties of three nonlinear crystals were in-vestigated: KTP, BBO and LiI0 3 . Therefore we built up a special Nd:YAG laser resonator producing a beam waist at the crystal location by an intracavity focusing lens and so increasing the intensity at the SHG crystal. Another advantage of the used resonator design is the possibility of coupling out the whole generated second-harmonic power. The obtained power outputs at 532 nm were greater than 10 W for KTP and about 1 W for BBO and LiI0 3 .