| Issue |
EPL
Volume 147, Number 3, August 2024
|
|
|---|---|---|
| Article Number | 35003 | |
| Number of page(s) | 6 | |
| Section | Atomic, molecular and optical physics | |
| DOI | https://doi.org/10.1209/0295-5075/ad5e1c | |
| Published online | 22 August 2024 | |
Enhanced optical pumping using mutually orthogonal magnetic fields for quantum sensing
1 Photonics and Quantum Optics Section, Atomic and Molecular Physics Division, Bhabha Atomic Research Centre Facility - Visakhapatnam-531011, India
2 Division of Mathematical and Physical Sciences, School of Arts and Sciences, Ahmedabad University Commerce Six Roads, Navrangpura, Ahmedabad-380009, India
3 Homi Bhabha National Institute, Department of Atomic Energy - Mumbai-400094, India
Received: 22 April 2024
Accepted: 2 July 2024
The atomic population trapped in irrelevant atomic states is a limiting factor for sensors based on laser-atom interaction. Using a bi-chromatic light field along with a specific combination of magnetic fields, we show a significant increase in the amplitude (i.e., more than seven times) of a two-photon coherent population trapping (CPT) resonance, which can be effectively used for atomic magnetometry. This increase in amplitude can be explained through enhanced optical pumping via the transfer of population to the relevant Zeeman states. Our experimental observations are consistent with the theoretical calculations carried out for a realistic three-level atomic system using density matrix formalism. We further discuss the optimum condition for enhanced optical pumping by adjusting the ground-state decoherence rate. Enhanced optical pumping through the manipulation of the magnetic field is quite important and is of great interest in the field of quantum technology.
© 2024 The author(s)
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