Conceptual design phase stray light analysis of the MOBIE imaging spectrograph for TMT

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The Multi-Object Broadband Imaging Echellette (MOBIE) is the seeing-limited, optical spectrograph planned for the first generation of Thirty Meter Telescope (TMT) instruments1. An end-to-end stray light analysis of the full optical path (telescope to detector array) has been undertaken as a first step towards validating the design concept with regard to stray light requirements. The geometric, stray light model includes the TMT Calotte-style dome structure, telescope optics, telescope support structures, and the MOBIE instrument itself. The stray light calculations, including assumptions, methodology, and conclusions, are described. Particular emphasis is placed on the stray light contributions from the telescope, atmospheric dispersion corrector, and spectrograph optics. Recommendations for stray light controls internal to the MOBIE instrument are discussed.

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