Efficient beam multiplexing and improving efficiency of a spatial light modulator using an iterative algorithm

Amar Deo Chandra; Ayan Banerjee

doi:10.1117/12.2569003

4 September 2020 Efficient beam multiplexing and improving efficiency of a spatial light modulator using an iterative algorithm

Amar Deo Chandra, Ayan Banerjee

Author Affiliations +

Proceedings Volume 11486, Laser Beam Shaping XX; 1148608 (2020) https://doi.org/10.1117/12.2569003
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

We generate optimised phase masks by using an Iterative Fourier Transform Algorithm (IFTA) and use it for beam multiplexing in an experiment to generate an array of uniform spots in 1D and 2D. We quantify the efficacy of the iterative algorithm experimentally by computing the uniformity and the efficiency and show that the optimised phase masks yield multiplexed beamlets having high uniformity ( 90%). We also find that the algorithm converges within few tens of iterations requiring moderate computational budget and can be useful for almost real-time applications. We compare the performance of the iterative algorithm with global linear corrections in the look-up table (LUT) of a phase limited SLM and find that the former perform with about 20% better efficiency. Besides obtaining array of 1D/2D spots having high uniformity using IFTA, our result exemplifies the use of iterative algorithms for improving efficiency of phase limited SLMs, which is a less explored area of research.

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Amar Deo Chandra and Ayan Banerjee "Efficient beam multiplexing and improving efficiency of a spatial light modulator using an iterative algorithm", Proc. SPIE 11486, Laser Beam Shaping XX, 1148608 (4 September 2020); https://doi.org/10.1117/12.2569003

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