MOIS: a configurable slit multi-object infrared spectrograph

A. Surya; M. Puravankara; B. Mookerjea; S. Poojary; S. L. A. D. Costa; M. Narang; P. P. Madhwani; A. P. K. Kutty; S. B. Bhagat; H. Shah; B. Banerjee; S. Gharat; R. Jadhav; V. N. Kurhade; J. V. Parmar; H. Tyagi

doi:10.1117/12.2677722

4 October 2023 MOIS: a configurable slit multi-object infrared spectrograph

A. Surya, M. Puravankara, B. Mookerjea, S. Poojary, S. L. A. D. Costa, M. Narang, P. P. Madhwani, A. P. K. Kutty, S. B. Bhagat, H. Shah, B. Banerjee, S. Gharat, R. Jadhav, V. N. Kurhade, J. V. Parmar, H. Tyagi

Author Affiliations +

Proceedings Volume 12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV; 126770A (2023) https://doi.org/10.1117/12.2677722
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

MOIS is a multi-object configurable slit spectrograph designed to be used with the 3.6 Devasthal Optical Telescope (DOT). It will cover the near-infrared wavelength band of 0.97 - 2.37 microns and have a spectroscopic field of view of 9.1′×3.1′ and an imaging field of view of 9.6′ diameter. MOIS is being designed as a precursor to a future multi-object spectrograph for the planned National Large Optical Telescope (NLOT) in India. MOIS is currently designed with a modular configurable slit unit of 5 slits created by 10 bars moving pair-wise in opposition. The slit unit can be upgraded independently to increase the multiplexing capability. The design has unique challenges of operating the configurable slits in cryo temperatures and developing the wide-field imager and spectrograph optical design for the input f/9 beam from the telescope. Many unique design optimizations have been used following several trade studies to allow better mechanical tolerances and flexibility in the design for position of coldstop and thermal performance. We will discuss the detailed design and modeling for MOIS that has been completed as part of the preliminary design.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

A. Surya, M. Puravankara, B. Mookerjea, S. Poojary, S. L. A. D. Costa, M. Narang, P. P. Madhwani, A. P. K. Kutty, S. B. Bhagat, H. Shah, B. Banerjee, S. Gharat, R. Jadhav, V. N. Kurhade, J. V. Parmar, and H. Tyagi "MOIS: a configurable slit multi-object infrared spectrograph", Proc. SPIE 12677, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV, 126770A (4 October 2023); https://doi.org/10.1117/12.2677722

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