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Digital micro-mirror devices for laser beam shaping
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Paper Abstract

Structured laser beams have numerous applications, for example mode division multiplexing, optical tweezers and even astronomy. Spatial Light Modulators are typically used to display digital holograms, however they have a low refresh rate, only work with a single polarisation and operate on a limited range of wavelengths. Digital Micro-mirror Devices are able to spatially modify the amplitude of incident light as opposed the the phase and are increasing in popularity due to their high refresh rate, polarisation and wavelength invariance and they are able to work as digital holograms with the right encoding. We describe how these devices may be used in a laboratory environment for modal decomposition as well as some of their disadvantages. We describe a method to accurately measure the flatness of a DMD, which is one of the major issues with the devices.

Paper Details

Date Published: 24 January 2019
PDF: 6 pages
Proc. SPIE 11043, Fifth Conference on Sensors, MEMS, and Electro-Optic Systems, 110430Y (24 January 2019); doi: 10.1117/12.2501348
Show Author Affiliations
Mitchell A. Cox, Univ. of the Witwatersrand, Johannesburg (South Africa)
Ling Cheng, Univ. of the Witwatersrand, Johannesburg (South Africa)
Andrew Forbes, Univ. of the Witwatersrand, Johannesburg (South Africa)


Published in SPIE Proceedings Vol. 11043:
Fifth Conference on Sensors, MEMS, and Electro-Optic Systems
Monuko du Plessis, Editor(s)

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