HARMONI – the Extremely Large Telescope first light integral field spectrograph: pre-optics: stray light analysis

M. A. Garcia; E. G. Fenés; T. Belenguer; A. Alonso; B. García-Lorenzo; S. Regalado

doi:10.1117/12.2628787

29 August 2022 HARMONI – the Extremely Large Telescope first light integral field spectrograph: pre-optics: stray light analysis

M. A. Garcia, E. G. Fenés, T. Belenguer, A. Alonso, B. García-Lorenzo, S. Regalado

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121842T (2022) https://doi.org/10.1117/12.2628787
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

HARMONI is the first light visible and near-IR integral field spectrograph for the ELT. It covers a large spectral range from 450nm to 2450nm with resolving powers from 3500 to 18000 and spatial sampling from 60mas to 4mas. The pre-optics take light entering the science cryostat (from the telescope or calibration system), reformatting and conditioning to be suitable for input for the rest of the instrument. In this paper, we present a complete stray light analysis of the HARMONI pre-optics including scattering from optical surface roughness and coatings, unwanted light from mechanical mounts and mechanisms, ghost reflections and scattering from particulate contaminants. Several solutions to reduce this unwanted light are proposed.

Citation Download Citation

M. A. Garcia, E. G. Fenés, T. Belenguer, A. Alonso, B. García-Lorenzo, and S. Regalado "HARMONI – the Extremely Large Telescope first light integral field spectrograph: pre-optics: stray light analysis", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121842T (29 August 2022); https://doi.org/10.1117/12.2628787

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available