Abstract
We present a design for a unit magnification imaging relay that is compact. The design uses two mirrors, and one is used by light twice for a three-reflection system. The mirrors are specified with freeform surfaces. There are several tradeoffs of performance depending on field of view, F / #, and wavelength range. One example provides a 30-mm circular field of view at F / 2.8, and another example provides a circular field of view of 40 mm in diameter at F / 4 for a length of 1/4400 mm. Adding a third nearly flat mirror allows a system to provide a 50-mm field of view at F / 4 for a length of 420 mm. A last example includes a beam splitter cube to allow accessing the full field of view. These systems are diffraction limited at 550 nm.
Original language | English (US) |
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Article number | 095103 |
Journal | Optical Engineering |
Volume | 59 |
Issue number | 9 |
DOIs | |
State | Published - Sep 1 2020 |
Keywords
- freeform surfaces
- imaging relay
- plane symmetry
- reflective optics
- unit magnification
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Engineering(all)