Open AccessDesign of array of diffractive optical elements with inter-element coherent fan-outs
Author(s) -
Johan Stigwall,
Jörgen Bengtsson
Publication year - 2004
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.12.005675
Subject(s) - optics , fan out , beam (structure) , rotation (mathematics) , phase (matter) , computer science , set (abstract data type) , element (criminal law) , light beam , laser beams , laser , diffraction , physics , algorithm , telecommunications , artificial intelligence , chip , quantum mechanics , law , political science , programming language
Building on the optimal-rotation-angle method, an algorithm for the design of inter-element coherent arrays of diffractive optical elements (DOEs) was developed. The algorithm is intended for fan-out DOE arrays where the individual elements fan-out to a sub-set of points chosen from a common set of points. By iteratively optimizing the array of elements as a whole the proposed algorithm ensures that the light from neighbouring elements is in-phase in all fan-out points that are common to neighbouring DOEs. This is important in applications where a laser beam scans the DOE array and the fan-out intensities constitute a read-out of information since the in-phase condition ensures a smooth transition in the read-out as the beam moves from one DOE to the next. Simulations show that the inter-element in-phase condition can be imposed at virtually no expense in terms of optical performance, as compared to independently designed DOEs.