Characterization of a multi-etalon array for ultra-high resolution spectroscopy

Surangkhana Rukdee; Sagi Ben-Ami; Andrew Szentgyorgyi; Mercedez López-Morales; David Charbonneau; Juliana Garcia-Mejia

doi:10.1117/12.2561046

13 December 2020 Characterization of a multi-etalon array for ultra-high resolution spectroscopy

Surangkhana Rukdee, Sagi Ben-Ami, Andrew Szentgyorgyi, Mercedez López-Morales, David Charbonneau, Juliana Garcia-Mejia

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 114471N (2020) https://doi.org/10.1117/12.2561046
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

The upcoming Extremely Large Telescopes (ELTs) are expected to have the collecting area required to detect potential biosignature gases in the atmosphere of rocky planets around nearby low-mass stars. Some efforts are currently focusing on searching for molecular oxygen (O₂), since O₂ is a known biosignature on Earth. One of the most promising methods to search for O₂ is transmission spectroscopy in which high-resolution spectroscopy is combined with cross-correlation techniques. In this method, high spectral resolution is required both to resolve the exoplanet’s O₂ lines and to separate them from foreground telluric absorption. While current astronomical spectrographs typically achieve a spectral resolution of 100,000, recent studies show that resolutions of 300,000 – 400,000 are optimal to detect O₂ in the atmosphere of earth analogs with the ELTs. Fabry Perot Interferometer (FPI) arrays have been proposed as a relatively low-cost way to reach these resolutions. In this paper, we present performance results for our 2-FPI array lab prototype, which reaches a resolving power of 600,000. We further discuss the use of multi-cavity etalons (dualons) to be resolution boosters for existing spectrographs.

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Citation Download Citation

Surangkhana Rukdee, Sagi Ben-Ami, Andrew Szentgyorgyi, Mercedez López-Morales, David Charbonneau, and Juliana Garcia-Mejia "Characterization of a multi-etalon array for ultra-high resolution spectroscopy", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114471N (13 December 2020); https://doi.org/10.1117/12.2561046

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