Frequency Tunable Atomic Magnetometer based on an Atom Interferometer*

We theoretically and experimentally study a magnetically sensitive atom interferometer. Using a stationary atom cloud, a time-domain interferometer is formed on magnetically sensitive states of $^{85}$Rb. We show that the temporal spacing of a Raman pulse sequence controls the frequency of the magnetic field detected by the interferometer, thereby potentially eliminating unwanted noise and optimizing detection in frequency bands of interest. We focus on a standard $\pi/2-\pi-\pi/2$ sequence and explore the utility of multiple $\pi$ pulses. \\[4pt] The Lincoln Laboratory portion of this work is sponsored by the Assistant Secretary of Defense for Research \& Engineering under Air Force Contract \#FA8721-05-C-0002. Opinions, interpretations, conclusions and recommendations are those of the authors and are not necessarily endorsed by the United States Government.