A novel compact 4-channel beam splitter based on a Kösters-type prism

Abstract

We introduce a novel compact 4-channel beam splitter which is based on a combination of dichroic coatings and internal total reflection, similar in concept to the interference double-prism invented by Kösters 90 years ago. Used with a rapidly-slewing 50 cm telescope in space, this would allow to double the presently known gamma-ray bursts at high (>5) redshift within 2 years.

arXiv comment11 pages, 9 figures; subm. to special issue "Space Optics 2021" of CEAS Space Journal

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