title: Phase correction of light modulators.
abstract: A new and inexpensive holographic technique for measuring the phase errors of a two-dimensional spatial light modulator (SLM) is described, and experimental verification is provided. A new technique to correct spatial phase errors in any SLM is then detailed and experimentally demonstrated. This technique is employed for the Radio Shack liquid-crystal television SLM, and a shift-invariant correlator is obtained. Additional low-pass filtering techniques (appropriate for any SLM with a fixed pattern of modulating cells) are discussed that provide improved contrast and achieve proper correlations.
authors.affiliation: Carnegie-Mellon University, Department of Electrical and Computer Engineering, Pittsburgh, Pennsylvania 15213, USA.
authors.forename: D
authors.initials: D
authors.lastname: Casasent
authors.forename: S F
authors.initials: SF
authors.lastname: Xia