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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 14, Iss. 4 — Apr. 1, 1997
  • pp: 808–815

Zeroth-order coding of complex amplitude in two dimensions

Ville Kettunen, Pasi Vahimaa, Jari Turunen, and Eero Noponen  »View Author Affiliations


JOSA A, Vol. 14, Issue 4, pp. 808-815 (1997)
http://dx.doi.org/10.1364/JOSAA.14.000808


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Abstract

Diffractive elements that modulate both the amplitude and the phase of an optical field are designed with use of an iterative Fourier-transform algorithm with gradual amplitude clipping at the plane of the element. Unlike phase-only diffractive elements, these complex-amplitude modulating elements do not generate noise outside the signal window W, and their diffraction efficiencies are comparable to the efficiencies of phase-only elements with a noiseless frame around W. Encoding techniques of the complex amplitude into variations of the diffraction efficiency and phase of the zeroth order of a carrier grating are introduced: the shape and the depth of a substructure within each rectangular pixel are modulated. Approximate and rigorous diffraction calculations are performed to compare different substructuring schemes, which all deflect the noise far away from W but differ, for example, in the manner in which this noise is distributed in the signal plane.

© 1997 Optical Society of America

History
Original Manuscript: June 5, 1996
Revised Manuscript: September 9, 1996
Manuscript Accepted: October 15, 1996
Published: April 1, 1997

Citation
Ville Kettunen, Pasi Vahimaa, Jari Turunen, and Eero Noponen, "Zeroth-order coding of complex amplitude in two dimensions," J. Opt. Soc. Am. A 14, 808-815 (1997)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-14-4-808

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