We demonstrate optical-beam phase conjugation by the process of two-beam coupling in photorefractive barium titanate. The incident, image-bearing beam causes exponential gain for counterpropagating waves, which are fed by noise and emerge with a power of the order of 10% of the incident beam and phase conjugate to it. This is expected from the calculated plane-wave gain plus the analogy to the theory of phase conjugation of complex wave fronts by stimulated Brillouin backscattering. We conjugate beams at either 515 or 488 nm at between 10- and 50-mW power, and find, as expected, no frequency shift (<1 Hz) in the process.
© 1985 Optical Society of America
Original Manuscript: March 26, 1985
Manuscript Accepted: May 28, 1985
Published: August 1, 1985
Tallis Y. Chang and R. W. Hellwarth, "Optical phase conjugation by backscattering in barium titanate," Opt. Lett. 10, 408-410 (1985)