Fig. 3: Interferograms and phase shifts.

Without supermirror: a A subset of interferograms recorded as intensity oscillations by rotating the phase shifter orientation, together with respective sinusoidal fit functions, for 2.5 kHz, 7.5 kHz, 12.5 kHz, and 17.5 kHz. With increasing frequency the interferograms are continuously shifted. Error bars indicate ±1 standard deviation. Gray dotted line is to guide the eye for the observed phase shift. b Linearly fitted phase of interferograms relative to the static case dependent on the rotation frequency of the magnetic field inside the RFG. Similar plots c and d recorded with supermirror inserted into the beam for additional spin analysis.