Design of an optical refocusing illumination system for use in laser-scanning devices

L. Smeesters; W. Meulebroeck; H. Thienpont

doi:10.1117/12.2309856

28 May 2018 Design of an optical refocusing illumination system for use in laser-scanning devices

L. Smeesters, W. Meulebroeck, H. Thienpont

Proceedings Volume 10693, Illumination Optics V; 1069302 (2018) https://doi.org/10.1117/12.2309856
Event: SPIE Optical Systems Design, 2018, Frankfurt, Germany

Abstract

Optical laser-scanning systems generally contain a scanning lens, like an f-theta lens, to enable a planar imaging field. However, commercially available f-theta lenses show limited working distances and scan fields, while their lens diameter rapidly scales with the scanning range giving rise to bulky lens systems. Therefore, we propose a novel scanning lens configuration, based on a compact tunable lens system, generating a planar imaging field within scanning configurations that require broad scanning fields at large working distances. Particularly, we developed a refocusing illumination lens system, comprising a voltage tunable liquid lens positioned in the centre between 2 passive aspherical lenses. Our novel developed optical system is implementable between the laser source and scanning mirror in a polygon laser-scanning system and ensures a constant spot size along a 640 mm scanning line at a working distance of 900 mm. The voltage tunable liquid lens (Arctic 316 lens of Varioptic) enables to adapt the focal length by the application of a voltage, while the passive aspherical lenses allow to enlarge the working distances and to correct for aberrations. We obtained a compact lens system (system length of 71.8 mm) showing a tunable back focal length between 1078 mm and 1134 mm and 1/e² spot diameters between 229 μm and 238 μm along the scanning line. Furthermore, we successfully demonstrate the performance of our simulated advanced refocusing illumination system in a laser-based scanning configuration, indicating its potential for integration in industrial scanning systems operating at large working distances while requiring large scanning fields.

Citation Download Citation

L. Smeesters, W. Meulebroeck, and H. Thienpont "Design of an optical refocusing illumination system for use in laser-scanning devices", Proc. SPIE 10693, Illumination Optics V, 1069302 (28 May 2018); https://doi.org/10.1117/12.2309856

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KEYWORDS

Imaging systems

Optical scanning systems

Lens design

Optical design

Liquid lenses

Aspheric lenses

Liquids

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