Concept for calibration of OSIRIS with a Fabry-Pérot etalon

Ronald A. López; Caroline von Raesfeld; Michael P. Fitzgerald; Tuan Do

doi:10.1117/12.2629505

29 August 2022 Concept for calibration of OSIRIS with a Fabry-Pérot etalon

Ronald A. López, Caroline von Raesfeld, Michael P. Fitzgerald, Tuan Do

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121845O (2022) https://doi.org/10.1117/12.2629505
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

We present the design requirements and initial design concept for a Fabry-P´erot etalon calibration system for use on the OSIRIS instrument on the Keck I telescope. OSIRIS is an R∼3800 near-infrared integral field spectrograph designed to take images and full spectra over a two-dimensional field. The spectrometer can produce ∼3000 spectra simultaneously, but proper spectral calibration of these data requires a dense grid of spectral lines, which is challenging to achieve with traditional calibration sources. OH lines and arc lines tend to be far apart with large gaps in between at these resolutions. Additionally, the layout of these tightly packed spectra can cause overlap and cross-talk between certain neighboring spectra. Small differences between lenses and thermal instability can also cause fluctuations in the light path, further complicating calibration. We aim to design an etalon that will produce evenly spaced calibration lines at high densities tuned specifically for OSIRIS that can be used to find more accurate wavelength solutions. The etalon lines also provide PSF references that can be used to disentangle confused neighboring spectra. Adding an etalon to the calibration unit on OSIRIS will improve the overall spectral calibration process.

Citation Download Citation

Ronald A. López, Caroline von Raesfeld, Michael P. Fitzgerald, and Tuan Do "Concept for calibration of OSIRIS with a Fabry-Pérot etalon", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121845O (29 August 2022); https://doi.org/10.1117/12.2629505

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