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21 November 2019 Structured light with digital micromirror devices: a guide to best practice
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Abstract

Digital micromirror devices (DMDs) have become ubiquitous as spatial light modulators in the optics community, but ambiguity remains on how best to implement them in a laboratory environment. Here, we explicitly tackle the problem of generating high fidelity modes of structured light while maintaining optical efficiency. We present a theoretical characterization of the diffractive properties of the DMD, allowing us to motivate an alignment procedure that improves optical efficiency. We also present a set of best practice recommendations that cover aspects of DMD operation that are not immediately intuitive, these best practice recommendations ensure structured light is generated with the correct spatial profile and wavefront. We present experimental results that show efficiency improvements of up to 20%. Further, we demonstrate the creation of modes of structured light with fidelities in excess of 96%. The best practices presented here provide a pragmatic set of procedures for ensuring DMDs are used to their fullest potential.

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2019/$28.00 © 2019 SPIE
Stirling Scholes, Ravin Kara, Jonathan Pinnell, Valeria Rodríguez-Fajardo, and Andrew Forbes "Structured light with digital micromirror devices: a guide to best practice," Optical Engineering 59(4), 041202 (21 November 2019). https://doi.org/10.1117/1.OE.59.4.041202
Received: 9 September 2019; Accepted: 14 October 2019; Published: 21 November 2019
JOURNAL ARTICLE
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