Abstract
A spatial light modulator is often used as the basic element in real-time recognition architectures. However, many of the devices suffer from poor uniformity and/or nonlinearities that affect the overall perfor- mance of any real-time recognition scheme. We propose using optical feedback as a method of improving device performance. We demon- strate both positive and negative feedback separately through a mixture of on-board electronic processors and optical polarization intensity en- coding. Placing the spatial light modulator in a positive feedback system causes the system to act like a memory. Placing the spatial light modu- lator in a negative feedback system makes the spatial light modulator response more analog, which in turn leads to improved uniformity. © 1998 Society of Photo-Optical Instrumentation Engineers. (S0091-3286(98)02103-5) Subject terms: spatial light modulators; optical feedback; signal processing; free space; ferroelectric.
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