PHOTOREFRACTIVE 2-WAVE MIXING OF RAPIDLY PHASE-MODULATED SIGNALS

We analytically solve the steady-state coupling equations of photorefr active two-wave mixing with a rapidly phase modulated signal for an ar bitrary complex coupling constant without the undepleted pump assumpti on. It shows that the imaginary part of the coupling constant also con tributes to the energy transfer in photorefractive two-wave mixing tho ugh the time average output intensity is only determined by the real p art of the coupling constant. The energy transfer may exist even when the real part of the coupling constant is zero. The photorefractive tw o-wave-mixing with high-speed sinusoidal phase modulation is discussed in detail.