Point-source atom interferometry (PSI) offers a pathway for realizing compact inertial sensors with relatively low experimental complexity. Rotation sensing in PSI gyroscopes uses the velocity distribution in an expanding cold-atomic cloud to realize many parallel atom interferometers with velocity-dependent phase shifts. The scale factor relating the rotation rate to the observed atomic population fringes depends on the spatial distribution of atoms at the beginning of the atom interferometry sequence. For magneto-optical trap-based PSI gyroscopes, these size-dependent corrections to the scale factor are significant and scale factor errors contribute to both the accuracy and long-term stability of PSI-based rotation measurements. For Gaussian atomic density profiles, scale factors can be analytically corrected using the magnification ratio between initial and final gas sizes. Here, we present a method to correct scale factor for arbitrary initial cloud shapes and sizes, and we comment on the limitations to long-term gyroscope stability due to cloud size stability.
|Presenter name||Seji Kang|