Violet and blue light SHG in optical superlattice LiNbO3

Optical superlattice LiNbO3 crystals with modulation periods were grown by Czochralski method. The generation of femtosecond pulses from violet to blue has been demonstrated in optical superlattice LiNbO3 crystals using third- order quasi-phase-matching. The output power of 9.0 mW at 390 nm, 11.5 mW at 402 nm, and 10.4 mW at 421 nm has been obtained. The dependence of the output power and the acceptance bandwidth on crystal length has been measured and theoretically discussed.