Unusually fast mutually pumped phase-conjugation (MPPC) is achieved in a Bi12TiO20 crystal by using transient photorefractive beam coupling under a dc electric field. Pulses of phase-conjugate waves with a buildup time of 4.5 ms and a width of 50 ms at an input intensity of 2×0.8 W/cm2 are obtained after applying a rising front of external electric field to the crystal. A phase-conjugation efficiency as high as 25% of the incident light power is measured.
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Raita et al. (1997) studied this question.
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