Cryogenic refractive indices for S-FPL55, S-LAL8, and S-BAH28 glasses for the HARMONI visible camera

Manuel A. Quijada; Douglas B. Leviton; John Capone; Matthias Tecza

doi:10.1117/12.2630451

29 August 2022 Cryogenic refractive indices for S-FPL55, S-LAL8, and S-BAH28 glasses for the HARMONI visible camera

Manuel A. Quijada, Douglas B. Leviton, John Capone, Matthias Tecza

Author Affiliations +

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 121882L (2022) https://doi.org/10.1117/12.2630451
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

This paper reports on absolute refractive index measurements for the S-FPL55, S-LAL8, and S-BAH28 glass materials that are used in the visible channel of the HARMONI integral field spectrograph of the Extreme Large Telescope (ELT). These measurements were carried out by using the world-class Cryogenic High Accuracy Refraction Measurement System (CHARMS) refractometer (located at the Goddard Space Flight Center) in the 0.420−3.5 μm wavelength range and in the cryogenic temperature range of 105−310K. We also report on the validity of a cold-lens system design that is based on extrapolated 300 K refractive index data in comparison with directly measured cryogenic data obtained with the CHARMS refractometer.

Citation Download Citation

Manuel A. Quijada, Douglas B. Leviton, John Capone, and Matthias Tecza "Cryogenic refractive indices for S-FPL55, S-LAL8, and S-BAH28 glasses for the HARMONI visible camera", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121882L (29 August 2022); https://doi.org/10.1117/12.2630451

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