Light diffraction device using reconfigurable spatial light modulators and the fractional talbot effect
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United States of America Patent
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Apr 1, 1997
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N/A
app pub date -
Nov 17, 1995
filing date -
Nov 28, 1994
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Expired
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Abstract
Light diffraction device using reconfigurable spatial light modulators and the fractional Talbot effect. This device comprises two liquid crystal, electrically addressable spatial light modulators (M1, M2) on a semiconductor substrate and at least one polarizing beam splitter (2), the optical path between the modulators being equal to (2k+1) Z.sub.T /4.sup.n in which k and n are natural integers, n differing from zero, and Z.sub.T is the Talbot distance relative to a biperiodic hologram obtained by means of one of the modulators and at one of the periods equal to double the other, which makes it possible to obtain a reconfigurable hologram having four phase levels. Application to optical telecommunications.
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