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Applied Optics

Applied Optics


  • Vol. 40, Iss. 8 — Mar. 10, 2001
  • pp: 1226–1235

Phase-only optical decryption of a fixed mask

Paul C. Mogensen and Jesper Glückstad  »View Author Affiliations

Applied Optics, Vol. 40, Issue 8, pp. 1226-1235 (2001)

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We present a system for the implementation of phase-only optical decryption of an encrypted fixed phase mask. We achieve decryption by superimposing a decrypting phase key, implemented on a phase-only spatial light modulator with an encrypted phase mask in two equivalent image planes in an optical system. The decrypted phase information is retrieved by the generalized phase-contrast technique. We have constructed a compact experimental system that uses a 635-nm diode laser in which a fixed encrypted 0/π binary phase mask is decrypted by a binary phase key produced electronically on the spatial light modulator. The key is aligned by electronic scrolling of its position with respect to the mask.

© 2001 Optical Society of America

OCIS Codes
(070.4560) Fourier optics and signal processing : Data processing by optical means
(100.5090) Image processing : Phase-only filters
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(230.6120) Optical devices : Spatial light modulators
(350.5030) Other areas of optics : Phase

Original Manuscript: June 1, 2000
Revised Manuscript: October 24, 2000
Published: March 10, 2001

Paul C. Mogensen and Jesper Glückstad, "Phase-only optical decryption of a fixed mask," Appl. Opt. 40, 1226-1235 (2001)

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