Red and blue light generation in an LiTaO3 crystal with a double grating domain structure

Simultaneous red and blue light generation in an LiTaO3 crystal with a doub le grating structure is reported for the first time. The double grating con sists of two separate domain reversal sequences (superlattices) in series a nd is fabricated by the field poling technique at room temperature. Using a picosecond 532 nm laser as a pump source, the red light at 631 nm and blue light at 460 nm are generated at the same time. A possible application of the superlattice crystal is presented.