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25 February 2021 Optical design of a compact and anastigmatic off-axis three-mirror system using freeform surfaces
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Abstract

We present a new optical design of an off-axis three-mirror system (OTS) that is corrected for spherical, coma, astigmatism, and field curvature aberrations. Our design methodology begins using paraxial theory and continues with the third-order approach for a coaxial three-mirror system (CTS) with a wide field of view and high resolution. We propose to use only two optical elements because the primary and tertiary mirrors will be integrated in a single optical element, the secondary mirror will be the other optical element. For our final design, we will use only off-axis surfaces. Thus it will be possible to obtain a compact, light, easy-to-align optical system with high stability. However, when the CTS is transformed into an OTS, new aberrations are generated. The last step in our methodology is to use freeform surfaces to compensate for new aberrations. With this methodology, a limited diffraction system is obtained.

© 2021 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2021/$28.00 © 2021 SPIE
Jorge Alvarado-Martínez, Fermín-Salomón Granados-Agustín, Sergio Vázquez-Montiel, Alexis Vázquez-Villa, and Alejandro Cornejo-Rodríguez "Optical design of a compact and anastigmatic off-axis three-mirror system using freeform surfaces," Optical Engineering 60(5), 051209 (25 February 2021). https://doi.org/10.1117/1.OE.60.5.051209
Received: 1 October 2020; Accepted: 26 January 2021; Published: 25 February 2021
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