Experimental versus simulated secondary scan patterns produced by a pair of Risley prisms

Alexandru-Lucian Dimb; Virgil-Florin Duma

doi:10.1117/12.2665027

10 August 2023 Experimental versus simulated secondary scan patterns produced by a pair of Risley prisms

Alexandru-Lucian Dimb, Virgil-Florin Duma

Proceedings Volume 12619, Modeling Aspects in Optical Metrology IX; 126190E (2023) https://doi.org/10.1117/12.2665027
Event: SPIE Optical Metrology, 2023, Munich, Germany

Abstract

Devices with a pair of rotational Risley prisms are one of the most common and fastest 2D laser scanners. The present work builds on the novel, graphical method we have developed [Proc. of the Romanian Acad. Series A 19, 2018; Applied Sciences 11, 2021; Symmetry 15, 2023] to simulate and study scan patterns of such devices. Our method has the advantage to generate exact patterns, in contrast to approximate methods. Also, it is easy to use, in contrast to analytical methods. This graphical approach allows for fulfilling the aim of this work: to utilize ghost rays (which are usually avoided in optical systems) in order to increase the fill factor (FF) of scan patterns. Thus, secondary scan patterns are produced and studied. A radiometric threshold is set for such patterns – to maintain the emerging flux from the prisms above a certain minimum level. With this condition, three useful secondary ray trajectories can be identified through the system. One of the four possible configurations of this type of scanner is considered in this study. Dimensions and characteristics of the secondary scan patterns are pointed out, in comparison to the “main” scan pattern, generated when pure refraction is considered throughout the prisms. Simulations, as well as experiments are carried out.

Conference Presentation

Citation Download Citation

Alexandru-Lucian Dimb and Virgil-Florin Duma "Experimental versus simulated secondary scan patterns produced by a pair of Risley prisms", Proc. SPIE 12619, Modeling Aspects in Optical Metrology IX, 126190E (10 August 2023); https://doi.org/10.1117/12.2665027

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