Edge-enhanced correlation with four-wave mixing in bismuth silicon oxide crystal by use of moving gratings

The nonlinearity of phase-conjugate beam reflection with four-wave mixing i n bismuth silicon oxide crystal by use of moving gratings at large fringe m odulation formed by the incident-beam ratio is investigated. On the basis o f this investigation, the edge enhancement of an object and the edge-enhanc ed optical correlation with improved discrimination capability are achieved by use of moving gratings at an appropriate hinge velocity. Experimental r esults are presented. (C) 2000 Optical Society of America OCIS codes: 100.4 550, 100.2980, 160.5320.