A frequency selective atom interferometer magnetometer

Abstract

In this article, we discuss the magnetic-field frequency selectivity of a time-domain interferometer based on the number and timing of intermediate π pulses. We theoretically show that by adjusting the number of π pulses and the π -pulse timing, we can control the frequency selectivity of the interferometer to time varying and DC magnetic fields. We present experimental data demonstrating increased coherence time due to bandwidth filtering with the inclusion of a π pulse between the initial and final π/2 pulses, which mitigates sensitivity to low frequency magnetic fields.

Experiment to Detect Dark Energy Forces Using Atom Interferometry

“…Atom interferometry with stimulated Raman transitions [9,10] is a most sensitive technique for detecting small accelerations. It is already well established as the basis for ultra-sensitive gravimeters [11], gyroscopes [12], magnetometers [13], and accelerometers [14] and for applications in metrology [15,16], tests of general relativity [17], and gravitational waves detection [18][19][20]. In our experiment, counter-propagating laser beams along the z axis, differing in frequency by 6.8 GHz, drive the clock transition in rubidium-87 atoms through a Raman process.…”

Transient development of Zeeman electromagnetically induced transparency during propagation of Raman–Ramsey pulses through Rb buffer gas cell

“…Ramsey-like measurements of Zeeman decoherence that determine the dumping rate of such oscillations are presented in [36]. One application of Ramsey interference is frequency selective magnetometer based on light-pulse atom interferometry, as described in [37]. Implementation of a compact atomic clock based on Ramsey-CPT interference is proposed in [38].…”

A tunable AC atom interferometer magnetometer

“…Therefore, it is of interest to develop magnetometers with frequency selective filtering in which signals of interest are enhanced relative to signals outside of the frequency bands of interest. Such a device has recently been demonstrated [4].…”

“…In the frequency domain, we can understand the frequency response as being the sensitivity or filtering function. As derived by Biercuk [5] in the context of ions and discussed in [4] with respect to atom interferometry, the filtering action of a pulse sequence consisting of a π/2 pulse, N π pulses at times δ n T and a final π/2 can be written as…”