PHOTOREFRACTIVE JOINT TRANSFORM CORRELATOR USING INCOHERENT ERASURE IN 2-WAVE-MIXING AND 4-WAVE-MIXING GEOMETRIES IN A BATIO3 CRYSTAL

The outcomes of some experimental and simulation studies performed on an incoherent-erasure photorefractive joint transform correlator (PR J TC) in the two-wave- and four-wave-mixing geometries are demonstrated. Computer simulation results show the effectiveness with which nonline ar transfer characteristics can be achieved in the incoherent-erasure configuration of the JTC. These can be exploited to attain different f ilter operations, e.g., matched, phase-only, and inverse filters by va rying beam ratios. Experimental limitations with PR barium titanate cr ystal entail the incoherent erasure (IE) JTC operation with all filter actions and encourage to this goal further investigations with fast P R materials. (C) 1998 Society of Photo-Optical Instrumentation Enginee rs.