Locally and temporally resolved image-based determination of the refractive index distribution during additive manufacturing of polymer

A. Heinrich; M. Rank

doi:10.1117/12.2647273

14 March 2023 Locally and temporally resolved image-based determination of the refractive index distribution during additive manufacturing of polymer

A. Heinrich, M. Rank

Author Affiliations +

Proceedings Volume 12418, Organic Photonic Materials and Devices XXV; 124180B (2023) https://doi.org/10.1117/12.2647273
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

In many areas a spatially and temporally resolved measurement of the refractive index is desirable. This also applies to the additive manufacturing of optical components. Thereby the resulting refractive index of the optics to be printed depends on the degree of curing of the polymer. The latter is directly related to the UV radiation used. Here we want to introduce a measuring system based on total internal reflection, which can be used to measure the refractive index of a polymer during polymerization using a UV projection system. In detail the sample to be examined is located on a prism and can be cured using a DLP projection system. A laser beam is focused on the interface between the sample and the prism. Due to the focusing, light rays hit the sample from a certain angle range. Depending on the condition for total reflection, these light rays are either totally reflected or decoupled from the prism. By determining the critical angle, conclusions can be drawn about the refractive index of the sample. In this way a locally and temporally resolved image-based determination of the refractive index distribution is possible.

Conference Presentation

Citation Download Citation

A. Heinrich and M. Rank "Locally and temporally resolved image-based determination of the refractive index distribution during additive manufacturing of polymer", Proc. SPIE 12418, Organic Photonic Materials and Devices XXV, 124180B (14 March 2023); https://doi.org/10.1117/12.2647273

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