Periodically poled lithium niobate (PPLN), fabricated with electric-field poling using lightographically defined electrodes, has enabled the development of practical quasi-phasematched (QPM) optical parametric oscillators (OPOs).[1] The first QPM OPO was demonstrated in the summer of 1994.[2] The basic material fabrication techniques have been extended to processing of full 3- inch-diameter wafers, currently PPLN crystals up to 60-mm long are regularly fabricated in 0.5-mm-thick substrates with domain periods 15-30-μm necessary for IR interactions.

© 1996 Optical Society of America

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