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5 March 2021 Synchronous coherent population trapping for remote magnetic field measurement
Renu Tripathi, Raghwinder Grewal, Gour S. Pati, Mauricio Pulido
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Proceedings Volume 11700, Optical and Quantum Sensing and Precision Metrology; 117002U (2021) https://doi.org/10.1117/12.2582433
Event: SPIE OPTO, 2021, Online Only
Abstract
We demonstrate a new mechanism, suitable for performing remote earth field measurement using synchronous modulation of two laser fields, which are two-photon resonant with the sodium atom’s hyperfine ground states. This mechanism relies on coherent population trapping (CPT), and thus, called the synchronous CPT scheme. We have measured the magnetic resonances in fluorescence from a sodium cell to demonstrate suitability of this scheme for remote magnetometry. A strong magnetic resonance with its dip corresponding to the Larmor frequency is produced in the presence of a transverse magnetic field. To estimate the optimal duty cycle of light modulation for attaining high performance, we measured the amplitudes and linewidths of the magnetic resonance as a function of the duty cycle, by keeping the peak intensity in CPT fields constant.
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Renu Tripathi, Raghwinder Grewal, Gour S. Pati, and Mauricio Pulido "Synchronous coherent population trapping for remote magnetic field measurement", Proc. SPIE 11700, Optical and Quantum Sensing and Precision Metrology, 117002U (5 March 2021); https://doi.org/10.1117/12.2582433
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KEYWORDS
Magnetism
Modulation
Sodium
Chemical species
Luminescence
Laser induced fluorescence
Mesosphere
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