Rubidium transitions as wavelength reference for astronomical Doppler spectrographs

D. Rogozin; T. Feger; C. Schwab; Y. V. Gurevich; G. Raskin; D. W. Coutts; J. Stuermer; A. Seifahrt; T. Fuehrer; T. Legero; H. Van Winckel; S. Halverson; A. Quirrenbach

doi:10.1117/12.2541317

3 January 2020 Rubidium transitions as wavelength reference for astronomical Doppler spectrographs

D. Rogozin, T. Feger, C. Schwab, Y. V. Gurevich, G. Raskin, D. W. Coutts, J. Stuermer, A. Seifahrt, T. Fuehrer, T. Legero, H. Van Winckel, S. Halverson, A. Quirrenbach

Author Affiliations +

Proceedings Volume 11203, Advances in Optical Astronomical Instrumentation 2019; 112031N (2020) https://doi.org/10.1117/12.2541317
Event: ANZCOP, 2019, Melbourne, Australia

Abstract

Precise wavelength calibration is a critical issue for high-resolution spectroscopic observations. The ideal calibration source should be able to provide a very stable and dense grid of evenly distributed spectral lines of constant intensity. A new method which satisfies all mentioned conditions has been developed by our group. The approach is to actively measure the exact position of a single spectral line of a Fabry-Perot etalon with very high precision with a wavelength-tuneable laser and compare it to an extremely stable wavelength standard. The ideal choice of standard is the D2 absorption line of Rubidium, which has been used as an optical frequency standard for decades. With this technique, the problem of stable wavelength calibration of spectrographs becomes a problem of how reliably we can measure and anchor one etalon line to the Rb transition. In this work we present our self-built module for Rb saturated absorption spectroscopy and discuss its stability.

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D. Rogozin, T. Feger, C. Schwab, Y. V. Gurevich, G. Raskin, D. W. Coutts, J. Stuermer, A. Seifahrt, T. Fuehrer, T. Legero, H. Van Winckel, S. Halverson, and A. Quirrenbach "Rubidium transitions as wavelength reference for astronomical Doppler spectrographs", Proc. SPIE 11203, Advances in Optical Astronomical Instrumentation 2019, 112031N (3 January 2020); https://doi.org/10.1117/12.2541317

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KEYWORDS

Rubidium

Fabry–Perot interferometers

Calibration

Astronomy

Spectrographs

Doppler effect

Spectroscopy

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