PSEUDORANDOM PHASE-ONLY ENCODING OF REAL-TIME SPATIAL LIGHT MODULATORS

We previously proposed a method of mapping full-complex spatial modula tions into phase-only modulations. The Fourier transform of the encode d modulations approximates that of the original complex modulations. T he amplitude of each pixel is encoded by the property that the amplitu de of a random-phasor sum is reduced corresponding to its standard dev iation. Pseudorandom encoding is designed for phase-only spatial light modulators that produce 360 degrees phase shifts. Because such device s are rare, experiments are performed with a 326 degrees modulator com posed of two In Focus model TVT6000 liquid-crystal displays. Qualitati ve agreement with theory is achieved despite several nonideal properti es of the modulator. (C) 1996 Optical Society of America