Abstract

Two CO₂ TEA laser beams coincident on a 300 K sample of n-type 0.5-mm thick Hg_0.77Cd_0.23Te at an included angle of 2–7° generate two forward-mode phase conjugate signals.¹ A third beam from a different CO₂ TEA laser incident on the backside of the sample quenches the phase conjugate signals. The effect is seen at arbitrary polarization and angle of incidence of the third beam. The magnitude of the quenching depends on the intensity of the third beam. The effect is seen only when the front and backside beams overlap in space and time. We interpret these data in terms of two-photon excitation followed by an enhanced Auger recombination.

© 1985 Optical Society of America