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Proceedings Paper

High-efficiency computer-generated holograms
Author(s): Margit Ferstl; Ralf Steingrueber; Walther Fuerst; Sven Krueger; Stephan Teiwes
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Paper Abstract

Various diffractive optical elements have been fabricated for the visible wavelength region, mainly for laser beam splitting purposes, but also for the generation of arbitrary but predetermined intensity patterns (e.g. spirals, logos etc.). To obtain high efficiencies the computer-generated holograms were realized as transmissive diffractive phase elements (DPE). More detailed we report on a beam splitter which was intended to distribute an incoming laser beam into 40 partial beams of equal intensities arranged equidistantly on a circle. These circular beam splitters--designated to be used in a measuring system--were realized as binary phase elements. In addition DPEs, that generate a given arbitrary intensity pattern, were produced in 2- and 8-level approximation. The computer-generated phase elements with feature sizes down to the sub-micrometer range were fabricated in quartz-glass by means of microstructuring techniques. Due to our precise and well developed processes we realized binary- and multilevel microstructures of high optical quality. For the binary 1:40 beam splitters we reached diffraction efficiencies of about 60% and uniform spot intensities of better than +/- 2.5% of the average intensity value. The measured efficiency of the eight-level pattern generators was higher than 80%. The optical characterization of our components showed a good agreement with the results expected from simulations. Using simple embossing techniques we were able to replicate first test samples in organic polymers which showed good optical performances.

Paper Details

Date Published: 31 August 1999
PDF: 10 pages
Proc. SPIE 3879, Micromachine Technology for Diffractive and Holographic Optics, (31 August 1999); doi: 10.1117/12.360519
Show Author Affiliations
Margit Ferstl, Heinrich-Hertz-Institut fuer Nachrichtentechnik Berlin GmbH (Germany)
Ralf Steingrueber, Heinrich-Hertz-Institut fuer Nachrichtentechnik Berlin GmbH (Germany)
Walther Fuerst, Heinrich-Hertz-Institut fuer Nachrichtentechnik (Germany)
Sven Krueger, Humboldt Univ. Berlin (Germany)
Stephan Teiwes, Humboldt Univ. Berlin (Switzerland)

Published in SPIE Proceedings Vol. 3879:
Micromachine Technology for Diffractive and Holographic Optics
Sing H. Lee; J. Allen Cox, Editor(s)

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