Thurairethinam, Vinooja, Bocchieri, Andrea, Savini, Giorgio, Mugnai, Lorenzo V.  ORCID: https://orcid.org/0000-0002-9007-9802 and Pascale, Enzo
2025.
Modeling phase variations introduced by extreme broadband dichroics for astronomical photometry.
Journal of Astronomical Telescopes, Instruments, and Systems
11
(1)
, 014003.
10.1117/1.jatis.11.1.014003
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Abstract
The primary requirement of a manufactured optical surface is a combination of an optimized spectral performance to minimize spectral losses and an accurate mathematical definition of its surface form. Variations in the thicknesses of the coating layers of a dichroic beamsplitter can introduce deviations in the observed phase of the reflected and transmitted beams. Here, we use transmission line modeling to explore the effect of high- and low-spatial frequency variations in the thicknesses of the layers to assess the subsequent impact on the resulting phase of the outgoing beams of a dichroic. We apply our methodology to an extreme broadband dichroic designed to comply with the spectral requirements of a dichroic on the ARIEL telescope. We obtain estimates of the expected phase variations when subjected to high- and low-spatial frequency errors in thickness. We show that these non-uniformities introduce a wavelength-dependent shift in the observed phases of the outgoing beam, which may subsequently degrade the point spread function (PSF) using physical optics simulator (PAOS), an open-source, generic Physical Optics Propagation code, to assess the consequent impact on the PSF at the focal plane of the Fine Guidance System 2 (FGS2) photometer.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Publisher: | Society of Photo-optical Instrumentation Engineers |
| ISSN: | 2329-4124 |
| Date of First Compliant Deposit: | 6 May 2025 |
| Date of Acceptance: | 27 February 2025 |
| Last Modified: | 06 May 2025 13:29 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/177307 |
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