Simultaneous red and blue light generation in an LiTaO_(3) crystal with a double grating structure is first reported.The double grating consists of two separate domain reversal sequences(superlattices)in series and is fabricated by 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.
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