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Applied Optics

Applied Optics


  • Vol. 38, Iss. 23 — Aug. 10, 1999
  • pp: 5004–5013

Encoding amplitude information onto phase-only filters

Jeffrey A. Davis, Don M. Cottrell, Juan Campos, María J. Yzuel, and Ignacio Moreno  »View Author Affiliations

Applied Optics, Vol. 38, Issue 23, pp. 5004-5013 (1999)

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We report a new, to our knowledge, technique for encoding amplitude information onto a phase-only filter with a single liquid-crystal spatial light modulator. In our approach we spatially modulate the phase that is encoded onto the filter and, consequently, spatially modify the diffraction efficiency of the filter. Light that is not diffracted into the first order is sent into the zero order, effectively allowing for amplitude modulation of either the first-order or the zero-order diffracted light. This technique has several applications in both optical pattern recognition and image processing, including amplitude modulation and inverse filters. Experimental results are included for the new technique.

© 1999 Optical Society of America

OCIS Codes
(100.4550) Image processing : Correlators
(100.5010) Image processing : Pattern recognition
(100.5090) Image processing : Phase-only filters
(160.3710) Materials : Liquid crystals
(230.6120) Optical devices : Spatial light modulators

Original Manuscript: January 4, 1999
Revised Manuscript: April 5, 1999
Published: August 10, 1999

Jeffrey A. Davis, Don M. Cottrell, Juan Campos, María J. Yzuel, and Ignacio Moreno, "Encoding amplitude information onto phase-only filters," Appl. Opt. 38, 5004-5013 (1999)

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