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Proceedings Paper

Nonseparable surface-relief gratings that generate large arbitrary intensity beam arrays
Author(s): Rick L. Morrison; Michael J. Wojcik; D. Bruce Buchholz
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Paper Abstract

Custom designed surface-relief gratings are used to generate two-dimensional, uniform intensity beam arrays in several current digital free-space photonic system demonstrators. Although the design process for creating these gratings depends intrinsically on the size of the beam array; the optimization algorithm and the available computational resources ultimately determine the greatest complexity grating that is easily obtained. A new design algorithm is presented that has proven its ability to quickly design large beam array generators (128 X 128 and larger solutions) composed of either uniform intensity or arbitrary intensity beams. The algorithm produces two-dimensional non-separable binary phase or multiphase level solutions that yield a higher diffraction efficiency than separable dimension designs. Although the algorithm must optimize up to the order of 106 parameters that determine the intensities of from 16 to 32 K beam intensities, a personal computer will generate solutions in a matter of a few minutes to a few hours. We evaluate the algorithm performance for a number of designs and demonstrate several patterns that have been fabricated onto fused silica substrates via microlithography and reactive ion etching.

Paper Details

Date Published: 5 April 1995
PDF: 10 pages
Proc. SPIE 2400, Optoelectronic Interconnects III, (5 April 1995); doi: 10.1117/12.206330
Show Author Affiliations
Rick L. Morrison, AT&T Bell Labs. (United States)
Michael J. Wojcik, AT&T Bell Labs. (United States)
D. Bruce Buchholz, AT&T Bell Labs. (United States)

Published in SPIE Proceedings Vol. 2400:
Optoelectronic Interconnects III
Ray T. Chen; Harvard Scott Hinton, Editor(s)

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