V. N. Gladilin

Main parameters of light spatial modulators using single-crystal CdTe and GaAs(Cr) as photoreceptors

The sensitometric, resolvometric and dynamic characteristics of the spatial light modulators (LSM) with MDS-liquid crystal structure were investigated in the wavelength range from 0.4 to 1.5 micrometers at applied voltage frequencies f equals 103 to 105 Hz. The CdTe and GaAs(Cr) single crystal plates with thicknesses l equals 10 to 500 micrometers served as photoreceptors. The writing light modulation (with contrasts up to 100:1) was realized due to hybrid-effect in the nematic LC layers with the thicknesses 5 to 20 micrometers .

Input signal space coding application in IR-range image convertor

The attraction of the writing light coding application in the photosensitive devices results from both the possibility of the treatment of image pixel quantity exceeding significantly (by 2 to 3 orders) the photoreceptor number and the high efficiency of light energy use. The image convertor breadboards in which PbS and InSb resistors as well as Ge-diodes served as the photoreceptors were developed and investigated. To code the input signal by Hadamard-Walsh functions the spatial light modulators based on DKDP or different liquid crystals (LC) were used.