Abstract

Beam coupling and pulsations in BaTiO₃ were discussed earlier.¹ We report here interaction of two mutually coherent beams A₁ and A₂ from a He-Ne laser. The beam crossing angle in BaTiO₃ is 5^°, with A₁ making 78° with the C-axis. With individual pumpings, detectors D₁ and D₂ record self-pumped phase conjugates A₁ and A₂. With both beams on, they record [A₁(t) + Â₂(t) – Δ₂] and [A₂(t) + Â₁(t) — Δ₂], respectively, where Â₂ and Â1 represent cross coupling beams of A₂ and A₁ along A₁ and A₂, respectively, and Δ₁ and Δ₂ represent the erasure effects on A₁ and A₂ by A₂ and A₁ By recording first the intensities at D₁ and D₂, keeping both A₁ (3.25 mw) and A₂ (3.00 mw) on, and then turning off A₂, D₁ falls down suddenly in intensity to (A₁ — Δ₁) which rises and saturates at A₁(t), giving the relative values (a₁:Â₂: Δ₁) = (165:77:112). Similar observations by putting off A₁ give (a₂: Â₁: Δ₂) = (88:62:64). Intensity with simultaneous pumping will be smaller or larger than with individual pumping depending on whether  < Δ or  > Δ.

© 1989 Optical Society of America