Nonseparable surface-relief gratings that generate large arbitrary intensity beam arrays

Rick L. Morrison; Michael J. Wojcik; D. Bruce Buchholz

doi:10.1117/12.206330

5 April 1995 Nonseparable surface-relief gratings that generate large arbitrary intensity beam arrays

Rick L. Morrison, Michael J. Wojcik, D. Bruce Buchholz

Proceedings Volume 2400, Optoelectronic Interconnects III; (1995) https://doi.org/10.1117/12.206330
Event: Photonics West '95, 1995, San Jose, CA, United States

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.

Citation Download Citation

Rick L. Morrison, Michael J. Wojcik, and D. Bruce Buchholz "Nonseparable surface-relief gratings that generate large arbitrary intensity beam arrays", Proc. SPIE 2400, Optoelectronic Interconnects III, (5 April 1995); https://doi.org/10.1117/12.206330

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