OCT measurement of aspheric polymer lenses for adaptive assembly of micro optical imaging objectives

M. Riediger; M. Berger; M. Hoeren; N. König; D. Zontar; C. Brecher; R. Schmitt

doi:10.1117/12.2546119

3 March 2020 OCT measurement of aspheric polymer lenses for adaptive assembly of micro optical imaging objectives

M. Riediger, M. Berger, M. Hoeren, N. König, D. Zontar, C. Brecher, R. Schmitt

Proceedings Volume 11276, Optical Components and Materials XVII; 1127613 (2020) https://doi.org/10.1117/12.2546119
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Miniaturized optics are main components in many different areas ranging from smart devices over medical products to the area of automotive and mobility. Thus several million if not billions of small lenses are merged into objectives. The optical function of these objectives can only be guaranteed, if all optical surfaces not only meet the form tolerances of the optical design but also have the right position with respect to another. To ensure this, a measurement method has been developed, that is able to measure the surface form and the centration of both functional surfaces of single micro optical polymer lenses. The method bases on Optical Coherence Tomography (OCT) so that due to the tomographic measurement principle both functional surfaces can be captured in one measurement. Key challenge is the reconstruction of the geometric form of the functional surface facing away from the measurement head since it is distorted due to the refraction of light on the functional surface that faces towards the measurement head. The distortion needs to be corrected by means of backwards ray tracing. The OCT-based characterization of the single optical elements allows an adaptive assembly of micro optical imaging objectives by feeding back the individual shape of every single optical component to the assembly process. This information can be used for either selective assembly or the compensation of individual component tolerances by matching components whose form and centration errors cancel each other out in the overall system.

Citation Download Citation

M. Riediger, M. Berger, M. Hoeren, N. König, D. Zontar, C. Brecher, and R. Schmitt "OCT measurement of aspheric polymer lenses for adaptive assembly of micro optical imaging objectives", Proc. SPIE 11276, Optical Components and Materials XVII, 1127613 (3 March 2020); https://doi.org/10.1117/12.2546119

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KEYWORDS

Optical coherence tomography

Lenses

Objectives

Aspheric lenses

Polymers

Optical components

Assembly tolerances

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