Halogen source illumination optimization using a beam shaping biconic lens array

Lien Smeesters; Dries Rosseel; Michael Vervaeke; Hugo Thienpont

doi:10.1117/12.2677431

2 October 2023 Halogen source illumination optimization using a beam shaping biconic lens array

Lien Smeesters, Dries Rosseel, Michael Vervaeke, Hugo Thienpont

Proceedings Volume 12666, Current Developments in Lens Design and Optical Engineering XXIV; 1266607 (2023) https://doi.org/10.1117/12.2677431
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

Illumination optical design using non-coherent sources is of major interest for sensing applications requiring a uniform illumination. We present the development of a custom biconic lens array, enabling beam shaping of a halogen source array to a rectangular uniform illumination. First, the tungsten halogen sources were accurately modelled considering the nearfield emission pattern and broadband spectrum. Following, the illumination lens array is optimized, including a study on the optimal arrangement and pitch of the array, and ensuring a manufacturable design by taking the optical and mechanical tolerances into account. The optimized lens array comprises of custom lenses (Ø 20 mm) featuring a first spherical surface and a second biconic surface with different radii of curvature and aspherical coefficients (up to the 8th order) in the X and Y direction. A spatial uniformity, defined as the standard deviation of the flux distribution, of 0.0002 was achieved within the envisioned illumination area of 50 x 20 mm², being close to a perfect uniformity considering a targeted value of 0. Finally, the aspheric biconic lens is manufactured using ultraprecision diamond tooling (Nanotech 350FG), and its performance is successfully validated in a laboratory demonstrator setup, giving rise to an optimized and uniform halogen source illumination.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Lien Smeesters, Dries Rosseel, Michael Vervaeke, and Hugo Thienpont "Halogen source illumination optimization using a beam shaping biconic lens array", Proc. SPIE 12666, Current Developments in Lens Design and Optical Engineering XXIV, 1266607 (2 October 2023); https://doi.org/10.1117/12.2677431

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