PROGRAMMABLE OPTICAL PHASE-MOSTLY HOLOGRAMS WITH COUPLED-MODE MODULATION LIQUID-CRYSTAL TELEVISION

Commercial twisted nematic liquid-crystal television provides coupled phase and amplitude modulation. We propose a simple wedged shear plate interferometer for in situ measurement of its phase modulation and op erating curve. For a given operating curve, the coupled-mode modulatio n holograms are designed with an iterative method. We adjust the opera ting curve by rotating the polarizer and analyzer to obtain the optima l operating curve. The phase-mostly holograms yield good-quality recon structed images with the zero-order spot reduced to a minimum. Experim ental results are shown.