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Machine learning aided phase retrieval algorithm for beam splitting with an LCoS-SLM
Author(s): Dmitriy Mikhaylov; Baifan Zhou; Thomas Kiedrowski; Ralf Mikut; Andrés F. Lasagni
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Paper Abstract

Liquid crystal on silicon phase-only spatial light modulators are widely used for the generation of multi-spot patterns. The phase distribution in the modulator plane, corresponding to the target multi-spot intensity distribution in the focal plane, is calculated by means of the so-called phase retrieval algorithms. Due to deviations of the real optical setup from the ideal model, these algorithms often do not achieve the desired power distribution accuracy within the multi-spot patterns. In this study, we present a novel method for generating high quality multi-spot patterns even in the presence of optical system disturbances. The standard Iterative Fourier Transform Algorithm is extended by means of machine learning methods combined with an open camera feedback loop. The machine learning algorithm is used to predict the mapping function between the desired and the measured multi-spot beam profiles. The problem of generation of multispot patterns is divided into three complexity levels. Due to distinct parameter structures, each of the complexity levels requires differing solution approaches, particularly differing machine learning algorithms. This relation is discussed in detail eventually providing a solution for the simplest case of beam splitter pattern generation. Solutions for more complex problems are also suggested. The approach is validated, whereby one machine learning method is successfully implemented and tested experimentally.

Paper Details

Date Published: 4 March 2019
PDF: 10 pages
Proc. SPIE 10904, Laser Resonators, Microresonators, and Beam Control XXI, 109041M (4 March 2019); doi: 10.1117/12.2508673
Show Author Affiliations
Dmitriy Mikhaylov, Robert Bosch Manufacturing Solutions GmbH (Germany)
Technische Univ. Dresden (Germany)
Baifan Zhou, Robert Bosch GmbH (Germany)
Karlsruhe Institut für Technologie (Germany)
Thomas Kiedrowski, Robert Bosch GmbH (Germany)
Ralf Mikut, Karlsruhe Institut für Technologie (Germany)
Andrés F. Lasagni, Technische Univ. Dresden (Germany)
Fraunhofer Institut für Werkstoff- und Strahlentechnik IWS (Germany)

Published in SPIE Proceedings Vol. 10904:
Laser Resonators, Microresonators, and Beam Control XXI
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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