Compact, unit magnification, reflective imaging relay using freeform surfaces

Jose Sasian, Weichuan Gao

Research output: Contribution to journalArticlepeer-review

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 languageEnglish (US)
Article number095103
JournalOptical Engineering
Volume59
Issue number9
DOIs
StatePublished - 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)

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