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Frequency stability of the mode spectrum of broad bandwidth Fabry-Pérot interferometers



Jeffrey M. Jennings, Ryan C. Terrien, Connor Fredrick, Michael Grisham, Mark Notcutt, Samuel Halverson, Suvrath Mahadevan, Scott Diddams


When illuminated by a white light source, the discrete resonances of a Fabry- Perot interferometer (FP) provide a broad bandwidth, comb-like spectrum useful for frequency calibration. We report on the design, construction, and laboratory characterization of two planar, passively stabilized, low finesse (40) FPs spanning 380 nm to 930 nm and 780 nm to 1300 nm, with nominal free spectral ranges of 20 GHz and 30 GHz respectively. These instruments are intended to calibrate astronomical spectrographs in radial velocity searches for extrasolar planets. By tracking the frequency drift of three widely-separated resonances in each FP, we measure fractional frequency drift rates as low as 1e-10 per day. However, we find that the fractional drift rate varies across the three sample wavelengths, such that the drift of two given resonance modes disagrees with the ratio of their mode numbers. We explore possible causes of this behavior, as well as quantify the temperature and optical power sensitivity of the FPs. Our results demonstrate the advancement of Fabry-Perot interferometers as robust and frequency-stable calibrators for astronomical and other broad bandwidth spectroscopy applications, but also highlight the need for chromatic characterization of these systems.
OSA Continuum


Etalon, Exoplanet, Fabry-Perot, Frequency Combs, Optical cavity


Jennings, J. , Terrien, R. , Fredrick, C. , Grisham, M. , Notcutt, M. , Halverson, S. , Mahadevan, S. and Diddams, S. (2020), Frequency stability of the mode spectrum of broad bandwidth Fabry-Pérot interferometers, OSA Continuum, [online], (Accessed April 17, 2024)
Created April 27, 2020, Updated February 27, 2022