New chalcogenide glass development and optical property characterization by low-coherent interferometry

Spencer Novak; William Moreshead; Sam Rubin; Patrik Langehanenberg; Erik Stover

doi:10.1117/12.3000366

30 November 2023 New chalcogenide glass development and optical property characterization by low-coherent interferometry

Spencer Novak, William Moreshead, Sam Rubin, Patrik Langehanenberg, Erik Stover

Author Affiliations +

Proceedings Volume PC12778, Optifab 2023; PC127780H (2023) https://doi.org/10.1117/12.3000366
Event: SPIE Optifab, 2023, Rochester, New York, United States

Abstract

LightPath Technologies scales up chalcogenide glass for optics production. Understanding fabrication effects on refractive index and ensuring repeatability are crucial. They employ TRIOPTICS OptiSurf LTM system to investigate refractive variability. This system uses low-coherence interferometry to measure lens thickness and air gaps. Direct measurement requires group index knowledge for geometric thickness determination. TRIOPTICS GmbH addresses this with LensGage, an OptiSurf addon. LensGage consists of calibrated parallel plates, accurately determining geometric thickness and group index (+/-0.75nm and 0.0001 precision) in a single measurement at 1.31µm or 2.2µm. LensGage enables LightPath to improve quality and consistency of fabricated optics by enhancing their understanding of group index variability.

Conference Presentation

Citation Download Citation

Spencer Novak, William Moreshead, Sam Rubin, Patrik Langehanenberg, and Erik Stover "New chalcogenide glass development and optical property characterization by low-coherent interferometry", Proc. SPIE PC12778, Optifab 2023, PC127780H (30 November 2023); https://doi.org/10.1117/12.3000366

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