S. Sorgato,1 L. Smeestershttps://orcid.org/0000-0002-2431-1052,1 M. Vervaeke,1 K. Rochlitz,1 D. Rosseel,1 J. Verbaenen,1 H. Thienpont,1 T. Geernaert,1 J. Van Erps1
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We present a miniature freeform lightguide for sensing applications, designed according to the principles of the flow-line method from Nonimaging Optics. The optic is obtained by combining two 2D flow-line concentrators in a curved monolithic piece, achieving 45° half-acceptance angle and 40° beam steering in a very compact volume (about 1.3 x 2.0 x 20 mm3). We show how the initial design has been adjusted after a thorough tolerance analysis and describe its fabrication through plastic injection molding. The design of the mold involves a non-standard 3D-puzzle approach, which allows uniform high optical quality and minimizes the fillet radius on the optic.
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S. Sorgato, L. Smeesters, M. Vervaeke, K. Rochlitz, D. Rosseel, J. Verbaenen, H. Thienpont, T. Geernaert, J. Van Erps, "Design, tolerancing, and fabrication of a freeform lightguide based on the flow-line method," Proc. SPIE 12220, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XVIII, 122200C (3 October 2022); https://doi.org/10.1117/12.2634433