Precision measurement of molded optics including relational datum parameters by use of a scanning point multi-wavelength interferometer

N. Hennemann; M. Wendel

doi:10.1117/12.2633021

4 October 2022 Precision measurement of molded optics including relational datum parameters by use of a scanning point multi-wavelength interferometer

N. Hennemann, M. Wendel

Author Affiliations +

Proceedings Volume 12219, Polymer Optics and Molded Glass Optics: Design, Fabrication, and Materials 2022; 122190E (2022) https://doi.org/10.1117/12.2633021
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

The growing demands of optical systems lead to increasingly complex aspheres and freeforms. When measuring those, one not only has to consider the form error of single optical surfaces but also the geometrical relation of front and backside to each other, as well as of mechanical references to the optical axis. A suitable metrology solution to cover all those features is crucial to improve overall performance of molded optics. An established measurement system in asphere production, which is a promising approach in high precision freeform manufacturing as-well, is given by a scanning point interferometer basing on a multi-wavelength approach. The scanning principle enables for a great flexibility, reduces setup time and costs, and has almost no limitations in spherical departure. Due to the absolute measurement capability, it is beneficial for segmented and interrupted surfaces, which are common apertures of modern application’s optical elements. Basing on the before-mentioned multi-wavelength scanning approach, several new measurement options are available that enable relational measurements which correlate the lens front surface to its backside, as well as several fiducials. These new measurement options can be applied to molds as well as lenses of different diameters, materials, surface forms, and center thicknesses. A new feature even allows measurements through the lens which helps to increases throughput. This contribution gives a general overview of challenges when measuring complex surfaces, with a special focus on relational datum parameters and correlation of both sides of a lens.

Conference Presentation

Citation Download Citation

N. Hennemann and M. Wendel "Precision measurement of molded optics including relational datum parameters by use of a scanning point multi-wavelength interferometer", Proc. SPIE 12219, Polymer Optics and Molded Glass Optics: Design, Fabrication, and Materials 2022, 122190E (4 October 2022); https://doi.org/10.1117/12.2633021

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