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Remote magnetometry using fluorescence resonance in sodium vapor (Conference Presentation)
Author(s): Renu Tripathi; Kevin Heesh; Christiane Ebongue; Lorna Caesar; Gour S. Pati; Anthony W. Yu; Michael Krainak
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Paper Abstract

Measurement and monitoring of geomagnetic field in the mesosphere has many potential applications such as detection of oceanic currents, mapping of large-scale magnetic structures, and study of electric-current fluctuations in the ionosphere. Remote measurement of the geomagnetic field can be performed by optical pumping of sodium atoms in the mesosphere with an amplitude modulated (AM) light at the Larmor precession frequency, and observing the magnetic resonance in fluorescence at a ground station. In this context, we have conducted an experiment in the laboratory to demonstrate remote magnetic field measurement using fluorescence signal from a sodium cell. Sodium atoms in the cell are interrogated with AM light produced by an acousto-optic modulator (AOM), introduced in the beam path of a frequency-doubled amplified sodium laser made in our laboratory. Magnetic resonance observed in sodium cell fluorescence is studied as a function of varying magnetic field intensity. Characteristics of the magnetic resonance such as linewidth and contrast (or SNR), and their dependence on optical power density, AM duty cycle, B-field orientation and intensity are studied. Theoretical modeling and experimental measurements are also carried out to determine the sensitivity of the magnetometer for realizing remote magnetometry with mesospheric sodium atoms.

Paper Details

Date Published: 4 March 2019
Proc. SPIE 10934, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology, 1093403 (4 March 2019); doi: 10.1117/12.2507056
Show Author Affiliations
Renu Tripathi, Delaware State Univ. (United States)
Kevin Heesh, Delaware State Univ. (United States)
Christiane Ebongue, Delaware State Univ. (United States)
Lorna Caesar, Delaware State Univ. (United States)
Gour S. Pati, Delaware State Univ. (United States)
Anthony W. Yu, NASA Goddard Space Flight Ctr. (United States)
Michael Krainak, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 10934:
Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology
Selim M. Shahriar; Jacob Scheuer, Editor(s)

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