The Application Of Liquid Crystal Spatial Light Modulator In Adaptive Optics Image Information Processing System

Liquid crystal light modulator (LCSLM) is an important phase corrector. It is oneof the essential devices in modern optical information processing. Adaptive optics is atechnique of real-time control for optical wave front. The specific requirements ofLiquid crystal light modulator are determined by the time and space features of dynamicwave front disturbance. Two-dimensional optical negative feedback system withhigh-speed and parallel processing is an important method to use low-precision opticaldevices to realize high-precision optical image processing. It can realizes the iteratedfunction system (IFS) of two-dimensional optics negative feedback images bycombining with affine linear transformation. The IFS is the key technique to researchthe fractal and chaotic dynamic system.According to the distribution of liquid crystal molecular director in each layer, theextended Jones matrix of different incident angles of liquid crystal spatial lightmodulator and the equivalent refractive index of each layer are obtained. And theamplitude and phase modulation characteristics are achieved based on the extendedJones matrix and the equivalent refractive index of each layer. Then, the incident anglerequired range of pure phase modulation mode is obtained by combining the twocharacteristics. The experimental results show that the proposed method can determinethe oblique incidence angle range of LCSLM for phase-only modulation mode.According to the characteristic of LCSLM, mathematical models of thetwo-dimensional optical negative feedback system and the adaptive optical system arebuilt. In this paper, the feasibility of liquid crystal spatial light modulator as a phasecorrector in the two-dimensional optical negative feedback system be proved and theconstraint conditions of the of two-dimensional optical negative feedback systemconvergence are discussed. The experimental results not only verify the feasibility thatliquid crystal spatial light modulator is used as phase corrector in two-dimensionaloptical negative, but also obtain the constraint conditions of the system convergence.