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Applied Optics

Applied Optics


  • Vol. 37, Iss. 11 — Apr. 10, 1998
  • pp: 2011–2020

Kinoforms designed to produce different fan-out patterns for two wavelengths

Jörgen Bengtsson  »View Author Affiliations

Applied Optics, Vol. 37, Issue 11, pp. 2011-2020 (1998)

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Kinoforms (diffractive optical elements) were designed to produce different fan-out (i.e., spot) patterns when illuminated with green (543-nm wavelength) and red (633-nm) light. Three design examples are presented, each using one of three different techniques for this wavelength discrimination. If the fan-out pattern is to be produced in the near field (Fresnel region) of the kinoform, focusing–defocusing distinguishes between the two colors. For a far-field pattern the color distinction can be obtained either by active suppression of unwanted spots, which also decreases the diffraction efficiency, or, preferably, by an increase in the maximum phase modulation of the kinoform (to more than 2π rad). All three examples were designed with a method based on the full scalar wave equation and optimal-rotation-angle optimization. The designed kinoforms were manufactured and performed, at least qualitatively, as predicted by the design.

© 1998 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(090.1970) Holography : Diffractive optics

Original Manuscript: September 17, 1997
Revised Manuscript: December 1, 1997
Published: April 10, 1998

Jörgen Bengtsson, "Kinoforms designed to produce different fan-out patterns for two wavelengths," Appl. Opt. 37, 2011-2020 (1998)

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