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Generation of self-pumped phase conjugation from the -c face of BaTiO3 with femtosecond pulses.

We demonstrate a new configuration of self-pumped phase conjugation in BaTiO(3) with 450-nm femtosecond pulses. The pump beam enters the -c face of the crystal at an acute angle with respect to the +c axis. This geometry is different from all known geometries of self-pumped phase conjugations in BaTiO(3). Phase-conjugate reflectivity of 1.7% and a rise time of approximately 24 s are obtained at an average pump power of 10 mW. The ability of the phase conjugator to serve phase distortions correctly is demonstrated. We propose that the femtosecond phase conjugator operate with the hologram mechanism sharing as the double phase conjugator. The self-pumped phase-conjugate pulses are analyzed by femtosecond electric-field cross correlation.