Ms. Caroline von Raesfeld Profile

Caroline von Raesfeld

at Univ of California Los Angeles

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Proceedings Article | 29 August 2022 Poster + Paper

Concept for calibration of OSIRIS with a Fabry-Pérot etalon

Ronald López, Caroline von Raesfeld, Michael Fitzgerald, Tuan Do

Proceedings Volume 12184, 121845O (2022) https://doi.org/10.1117/12.2629505

KEYWORDS: Fabry–Perot interferometers, Point spread functions, Calibration, Reflectivity, Spectral calibration, Tolerancing, Refractive index, Manufacturing, Spectrographs, Lamps

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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.

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