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Proceedings Paper

Optical choppers with rotational elements: modeling, design and prototypes
Author(s): Virgil-Florin Duma; Octavian Cira; Dorin Demian
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Paper Abstract

We present a brief overview of our contributions regarding the analysis and design of optical choppers. Their applications range numerous domains, from optical sensing in radiometry or telescopes to laser manufacturing and biomedical imaging – for example for the controlled attenuation of light, the elimination of selected spectral domains, or the switching of optical paths. While these aspects are pointed out, the paper describes our analysis, modeling, and manufacturing of prototypes for choppers with: (a) wheels with windows with linear margins; (b) wheels with windows with non-linear margins (semi-circular or elliptical), outward or inward; (c) rotational shafts with different shapes, with slits or with holes. While variant (a) represents classical choppers, variant (b) represents the “eclipse” choppers that we have developed and also patented for the solution with two adjustable wheels that can produce circular windows. Variant (c), of choppers with shafts is also a patent application. Their transmission functions are discussed, for the shape of the laser pulses produced and for the attenuation coefficients obtained. While this discussion has been completed analytically for top-hat laser beams, it has been modeled using simulations for Gaussian and Bessel beams. Design, manufacturing aspects, and prototypes of the different chopper configurations complete the presentation.

Paper Details

Date Published: 16 May 2017
PDF: 7 pages
Proc. SPIE 10231, Optical Sensors 2017, 102311K (16 May 2017); doi: 10.1117/12.2265155
Show Author Affiliations
Virgil-Florin Duma, Aurel Vlaicu Univ. of Arad (Romania)
Politehnica Univ. of Timisoara (Romania)
Octavian Cira, Aurel Vlaicu Univ. of Arad (Romania)
Dorin Demian, Aurel Vlaicu Univ. of Arad (Romania)

Published in SPIE Proceedings Vol. 10231:
Optical Sensors 2017
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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