ItemArticle

A new broad-band atmospheric dispersion corrector for HROS-TMT

Title
A new broad-band atmospheric dispersion corrector for HROS-TMT
Creator
Bestha, Manjunath; Sivarani, Thirupathi; Wehbe, Bachar; Hasan, Amirul; Chandra, Bharat; Divakar, Devika K.; Unni, Athira; Menon, Parvathy; Surya, Arun; Saraf, Pallavi
Description
Atmospheric dispersion causes light from celestial objects with different wavelengths to refract at varying angles as it passes through Earths atmosphere. This effect results in an elongated image at the focal plane of a telescope and diminishes fibre coupling efficiency into spectrographs. We propose an optical design that incorporates a Rotational Atmospheric Dispersion Corrector (RADC) to address the broad-band dispersion for the multi-object mode of the High-Resolution Optical Spectrograph (HROS) on the Thirty Meter Telescope (TMT). The RADC corrects the dispersion across the entire wavelength range (0.311 ?m), using Amici prisms optimized for over 90 per cent transmission efficiency and minimal angular deviation of the beam from the optical axis after dispersion correction. For enhanced accuracy, particularly in the blue region, we have, for the first time, implemented the Filippenko model in Zemax via a custom Dynamic-Link Library (DLL) file. The Author(s) 2025. Published by Oxford University Press on behalf of Royal Astronomical Society.
Source
RAS Techniques and Instruments;Volume;4;Issue;;Article No.57
Date
01-01-2025
Publisher
Oxford University Press
Subject
atmospheric dispersion corrector; atmospheric effects; instrumentation; instrumentation: spectrographs; surveys; telescopes
Coverage
Bestha M., Indian Institute of Astrophysics, Bangalore, P-560034, India, Department of Applied Optics and Photonics, University of Calcutta, Kolkata, P-700106, India; Sivarani T., Indian Institute of Astrophysics, Bangalore, P-560034, India; Wehbe B., Instituto de Astrofica e Cicias do Espa, Universidade de Lisboa, Campo Grande, Lisboa, P-1749-016, Portugal, Departamento de Fica, Faculdade de Cicias, Universidade de Lisboa, Campo Grande, Lisboa, P-1749-016, Portugal; Hasan A., Indian Institute of Astrophysics, Bangalore, P-560034, India, Department of Physics and Electronics, Christ University, Bangalore, P-560029, India; Chandra P.B., Indian Institute of Astrophysics, Bangalore, P-560034, India; Divakar D.K., McDonald Observatory, University of Texas, Austin, P-78712, United States; Unni A., Department of Astronomy and Astrophysics, University of California, Santa Cruz, P-95064, United States; Menon P., Indian Institute of Astrophysics, Bangalore, P-560034, India, Department of Applied Optics and Photonics, University of Calcutta, Kolkata, P-700106, India; Surya A., Indian Institute of Astrophysics, Bangalore, P-560034, India; Saraf P., Indian Institute of Astrophysics, Bangalore, P-560034, India, Physical Research Laboratory, Astronomy and Astrophysics Division, Ahmadabad, P-380058, India
Rights
All Open Access; Gold Open Access
Relation
ISSN: 27528200;
Format
online
Language
English
Type
Article

Citation

Bestha, Manjunath; Sivarani, Thirupathi; Wehbe, Bachar; Hasan, Amirul; Chandra, Bharat; Divakar, Devika K.; Unni, Athira; Menon, Parvathy; Surya, Arun; Saraf, Pallavi, “A new broad-band atmospheric dispersion corrector for HROS-TMT,” CHRIST (Deemed To Be University) Institutional Repository, accessed June 18, 2026, https://archives.christuniversity.in/items/show/22828.

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