Enhanced beam coupling modulation using the polarization properties of photorefractive GaAs

Partovi, Afshin; Garmire, Elsa M.; Cheng, Li-Jen
August 1987
Applied Physics Letters;8/3/1987, Vol. 51 Issue 5, p299
Academic Journal
We report observation of a rotation in the polarization of the two photorefractive recording beams in GaAs for a configuration with the internally generated space-charge field along the <110> crystallographic orientation. This rotation is a result of simultaneous constructive and destructive beam coupling in each beam for the optical electric field components along the two electro-optically induced principal dielectric axes of the crystal. By turning one of the beams on and off, the intensity of the other beam after the crystal and a polarization analyzer can be modulated by as much as 500%. This result is of particular importance for optical information processing applications.


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