Non-conventional optomechanical choppers: analysis and design of novel prototypes

Virgil-Florin Duma; Dorin Demian; Eduard Sebastian Csukas; Nicolina Pop; Octavian Cira

doi:10.1117/12.2275937

16 October 2017 Non-conventional optomechanical choppers: analysis and design of novel prototypes

Virgil-Florin Duma, Dorin Demian, Eduard Sebastian Csukas, Nicolina Pop, Octavian Cira

Proceedings Volume 10448, Optifab 2017; 104481W (2017) https://doi.org/10.1117/12.2275937
Event: SPIE Optifab, 2017, Rochester, New York, United States

Abstract

Optical choppers are widely used in laser systems – for light modulation and/or attenuation. In their most used and wellknown configuration, they are built as a rotational wheel with windows, which transforms a continuous-wave laser beam into a series of impulses with a certain frequency and profile. We briefly present the analysis and design we have completed for the classical chopper wheels (i.e., with windows with linear margins) for both top-hat and Gaussian laser beams. Further on, novel chopper wheels configurations, with outward or inward semi-circular (or with other non-linear shaped) margins of the windows is pointed out; we completed for them both analytic functions and simulations, for both top-hat and Gaussian beams, in order to deduce their transmission functions (i.e., the time profile of the laser impulses generated by the device). The stress of the presentation is put on the novel choppers with shafts (patent pending); their transmission functions are pointed out for top-hat laser beams. Finally, an example of such choppers is considered, with regard to the necessary Finite Element Analysis (FEA) that has to be performed for their rotational shaft. Both the mechanical stress and the deformations in the shaft have to be taken into account, especially at high rotational speeds of the mobile element.

Citation Download Citation

Virgil-Florin Duma, Dorin Demian, Eduard Sebastian Csukas, Nicolina Pop, and Octavian Cira "Non-conventional optomechanical choppers: analysis and design of novel prototypes", Proc. SPIE 10448, Optifab 2017, 104481W (16 October 2017); https://doi.org/10.1117/12.2275937

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