Abstract
Phase-only filters are useful for matched filtering and other forms of Fourier-plane filters. Although these filters may be implemented simply on a phase-modulating spatial light modulator (SLM), it is also possible to use amplitude-modulating SLMs, even ones without grey-scale capability. Simple filters encoding two and three phase states are presented. These filters provide useful correlations even with a limited number of resolution points.
© 1987 Optical Society of America
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