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9 May 2018 Testing of optical choppers using laser lines
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Optical choppers are applied in a large range of systems, from radiometers and telescopes to spectral and biomedical apparatuses. While classical choppers are built as rotational disks with windows with linear margins (or with oscillatory elements, but also with linear margins to progressively obscure light beams), we have introduced two different types of such devices; (i) eclipse choppers, with disks windows with non-linear margins, oriented outward or inward; (ii) choppers with rotational shafts of different shapes (with slits of various profiles). The former are capable to produce laser impulses with other shapes than classical choppers, while the latter have the potential to achieve much higher chop frequencies than disk choppers in a more compact construct. We have considered in previous studies the typical case of laser beams with circular sections for these choppers. The present study explores a different case, of laser lines being chopped. Geometrical aspects of the obscuration of laser lines considered in different positions – and for different chopper configurations – are discussed. Experiments are carried out to determine the transmission functions for some of the above devices.
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Mihai Stefan Duma and Virgil-Florin Duma "Testing of optical choppers using laser lines", Proc. SPIE 10680, Optical Sensing and Detection V, 106802A (9 May 2018);


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