Spectrograph stabilization of 500x using a single-delay interferometer

David J. Erskine; Edward Wishnow; Eric Linder; Erik J. Davies; Martin Sirk; Richard Ozer; Dayne Fratanduono; Jerry Edelstein

doi:10.1117/12.2628388

29 August 2022 Spectrograph stabilization of 500x using a single-delay interferometer

David J. Erskine, Edward Wishnow, Eric Linder, Erik J. Davies, Martin Sirk, Richard Ozer, Dayne Fratanduono, Jerry Edelstein

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; (2022) https://doi.org/10.1117/12.2628388
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

State of the art astrophysics demands extremely stable wavelength measurements, e.g. few cm/s scale Doppler radial velocimetry for Earth-like planet detection or multi-year cosmic redshift drift measurements. We present new techniques for 500 − 1000× improvement in stability using an interferometer in series with a spectrograph to form an Externally Dispersed Interferometer (EDI). When the received spectrum suffers a wavelength jitter, the phase of the moir´e pattern from the interferometer delay shifts in opposite directions for two signal paths, nonfringing and fringing; with appropriate weightings (“crossfading”) the net phase reaction cancels, stabilizing the spectrum. We present an improvement to our previous technique of multiple delays, using a single delay to crossfade, and demonstrate stabilization of ≳ 500× on existing Hale Telescope data. Single-delay EDIs are easier to construct and operate than those with multiple delays, and the EDI ensures that exactly the same pixels are used for the science and calibration signals, and in constant proportion under intensity fluctuations, greatly easing positional requirements.

Citation Download Citation

David J. Erskine, Edward Wishnow, Eric Linder, Erik J. Davies, Martin Sirk, Richard Ozer, Dayne Fratanduono, and Jerry Edelstein "Spectrograph stabilization of 500x using a single-delay interferometer", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, (29 August 2022); https://doi.org/10.1117/12.2628388

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