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We present a method of frequency stabilizing a broadband etalon that canserve as a high-precision wavelength calibrator for an Echelle spectrograph.Using a laser to probe the Doppler-free saturated absorption of the rubidium D2line, we stabilize one etalon transmission peak directly to the rubidiumfrequency. The rubidium transition is an established frequency standard and hasbeen used to lock lasers to fractional stabilities of $<10^{-12}$, a level ofaccuracy far exceeding the demands of radial velocity (RV) searches forexoplanets. We describe a simple setup designed specifically for use at anobservatory and demonstrate that we can stabilize the etalon peak to a relativeprecision of $<10^{-10}$; this is equivalent to 3 cm/s RV precision.

Stabilizing a Fabry-Perot etalon to 3 cm/s for spectrograph calibration