SPATIAL LIGHT MODULATOR AND SPATIAL LIGHT MODULATING METHOD

摘要

A signal image is transmitted by write light from a transmission type liquid crystal element 4 to an optically-addressed type parallel-aligned nematic-liquid-crystal spatial light modulator 6. The numerical aperture NAL of a relay lens 5, the pitch P of the pixel structure of the transmission type liquid crystal element 4, and the wavelength lambda of light from the write light source 1 are set with the condition 1/2P < NAL/ lambda < 1/P. As a result, the signal component caused by the pixel structure can be erased. Furthermore, no degradation is generated in the entire range of the spatial frequencies of the signal image that can be produced by the transmission type liquid crystal element 4. <IMAGE>