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Roadmap for the unobscured three-mirror freeform design space
Optics Express
|October 7, 2021
Summary
This study maps the performance limits of freeform optics in three-mirror imagers. It provides designers with crucial pre-design information for achieving diffraction-limited performance in visible spectrum imaging systems.
Area of Science:
- Optical Engineering
- Freeform Optics Design
Background:
- Traditional rotationally symmetric lens design has established performance boundaries.
- Freeform optics offer benefits for unobscured three-mirror imagers, but their design space limits are not well-defined.
Purpose of the Study:
- To create a roadmap of specification ranges for freeform unobscured three-mirror imagers.
- To identify conditions where these systems achieve diffraction-limited performance in the visible spectrum.
Main Methods:
- Designed over 200 unique unobscured three-mirror imager systems.
- Analyzed performance across various field-of-view, entrance pupil diameter, and F-number combinations.
Main Results:
- Established the first-ever roadmap for freeform three-mirror imager design.
- Identified specific ranges for achieving diffraction-limited performance in the visible spectrum.
Conclusions:
- Freeform optics significantly enhance unobscured three-mirror imager performance.
- The findings provide essential pre-design guidance for optical engineers, applicable to both visible and infrared spectrums.
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