PHOTOREFRACTIVE 2-WAVE MIXING - COMPLEX AMPLITUDES SOLUTIONS IN THE CASE OF A WEAK SIGNAL BEAM

We present the analytical solution of the coupled equations system tha t describes two-wave mixing (2WM) in photorefractive media as an adapt ive beam combiner. The crystal operates in the drift regime with phase modulated weak signal beam. The complex amplitudes of the signal and pump beams at the exit of the crystal are expressed in terms of a comb ination of the input beam complex amplitudes. Experimental validation of our analytical solution is presented using a photorefractive Bi12Si O20 crystal (BSO) at lambda = 0.514 mu m.