Self-pumped phase conjugation with femtosecond pulses by use of BaTiO₃

Abstract

Self-pumped phase conjugation is generally believed to be attributed to degenerate four-wave mixing. Accordingly, the phenomenon requires the existence of three waves at certain interaction regions for the excitation of the fourth one. Although this condition is not satisfied by a train of femtosecond pulses with a repetition rate of 110 MHz, we have observed self-pumped conjugate pulses retroreflected by a BaTiO₃ crystal. The conjugate character of the pulses is demonstrated with the distorter method.

© 1996 Optical Society of America

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