Low-coherence interferometry applied to testing of CT and refractive index of lenses

Patrik Langehanenberg; Salah Seman Awel

doi:10.1117/12.2662224

10 July 2023 Low-coherence interferometry applied to testing of CT and refractive index of lenses

Proceedings Volume 12524, Dimensional Optical Metrology and Inspection for Practical Applications XII ; 125240B (2023) https://doi.org/10.1117/12.2662224
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

Low-coherence interferometry is a proven and powerful tool that can be applied for precise measurement of the optical path length between optical surfaces and thus, center thickness and air spacing. An advanced measurement setup allows to measure independent from refractive index information. After an initial calibration, the geometrical thickness of single optical components is measured directly. Furthermore, this technique can also be used to determine the (group) refractive index during production, e.g., of molded lenses, batch testing of optical materials or evaluate the effect of coatings on low Tg materials, to confirm consistent refractive index information and monitor manufacturing conditions. It can also be used for inverse search in the glass catalogue to identify unknown material.

Conference Presentation

Citation Download Citation

Patrik Langehanenberg and Salah Seman Awel "Low-coherence interferometry applied to testing of CT and refractive index of lenses", Proc. SPIE 12524, Dimensional Optical Metrology and Inspection for Practical Applications XII , 125240B (10 July 2023); https://doi.org/10.1117/12.2662224

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