Alignment of Multi-Order Diffractive Engineered (MODE) lens segments using the Kinematically-Engaged Yoke System

Marcos A. Esparza; Heejoo Choi; Dae Wook Kim

doi:10.1117/12.2569442

20 August 2020 Alignment of Multi-Order Diffractive Engineered (MODE) lens segments using the Kinematically-Engaged Yoke System

Marcos A. Esparza, Heejoo Choi, Dae Wook Kim

Author Affiliations +

Proceedings Volume 11487, Optical Manufacturing and Testing XIII; 114870V (2020) https://doi.org/10.1117/12.2569442
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

With the continued development of multi-order diffractive engineered (MODE) lenses that consist of both multi-order diffractive surfaces and a diffractive Fresnel lens surface, it is becoming more realistic that these components may be used as an ultralight large aperture primary for space telescopes. As conceptual designs for these large primaries push the size limits of optics manufactured by compression molding, it becomes necessary to make a segmented MODE lens primary rather than a monolithic one. We use the Kinematically-Engaged Yoke System (KEYS) to align the segments of a 0.24-m, PMMA, monochromatic, MODE-like lens (having no diffractive Fresnel lens features). The KEYS alignment system consists of modified ultra-fine alignment screws with ball bearings on the end that kinematically engage with the step-like features of the MODE lens surface (similar to a Fresnel lens) to constrain the segments in 5 degrees of freedom, leaving rotation about the optical axis unconstrained. The alignment of the segments is verified using multiple methods including a scanning white light interferometer and deflectometry. Such an alignment system has the capability of fixing the segments together in order to bond them with adhesive while aligned. These tests offer a proof of concept for a system that can be used for an eventual 0.24- m, compression molded, glass, segmented MODE lens.

Conference Presentation

Citation Download Citation

Marcos A. Esparza, Heejoo Choi, and Dae Wook Kim "Alignment of Multi-Order Diffractive Engineered (MODE) lens segments using the Kinematically-Engaged Yoke System", Proc. SPIE 11487, Optical Manufacturing and Testing XIII, 114870V (20 August 2020); https://doi.org/10.1117/12.2569442

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