arXiv:2408.10398

Reconfigurable circular polarization medium frequency atomic receiver using magneto-electric effect

Sujit Garain, Surya Narayan Sahoo, Ashok Kumar Mohapatra

Published Aug 19, 2024• 0 citations

Abstract

Nonlinear magnetoelectric effect(NME) in alkali atomic vapor has applications in precision magnetometry in the radio-frequency domain. We report the application of the NME in alkali atomic vapors for projective measurement of medium-frequency (MF) magnetic fields in a circular basis with an extinction ratio up to 500:1 . Utilizing a longitudinal static magnetic field, we demonstrate a high-sensitivity technique for characterizing the ellipticity of radio-frequency (RF) magnetic fields which can in turn be used for phase sensitive detection in mid frequency communication. Additionally, we demonstrate the conversion of binary phase shift keyed RF magnetic fields into amplitude modulation of generated optical fields, a versatile receiver for communication using the medium frequency band.

DOI: 10.48550/arxiv.2408.10398

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arXiv:2408.10398

Reconfigurable circular polarization medium frequency atomic receiver using magneto-electric effect

Sujit Garain, Surya Narayan Sahoo, Ashok Kumar Mohapatra

Published Aug 19, 2024• 0 citations

arXiv HTML PDF

Abstract

DOI: 10.48550/arxiv.2408.10398

Related papers

Nonlinear magnetoelectric effect in atomic vapor and its application to precision radio-frequency magnetometry

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arXiv:2610.08031Oct 6, 20260 citations

\mathrm{fT}/\sqrt{\text{Hz}}

at 1 kHz to 7.5

\mathrm{pT}/\sqrt{\text{Hz}}

at 3 MHz for zero bias field in an unshielded environment. The appealing features of the proposed rf magnetometer using our system include a high dynamic range up to

{10}^{12}

, 6 dB bandwidth of 450 kHz, and arbitrary frequency resolution, which are intrinsic to the nonlinear ME effect in the medium.

7\text{ }\text{fT}/\sqrt{\text{Hz}}

with a miniature $5\ifmmode\times\else\texttimes\fi{}5\ifmmode\times\else\texttimes\fi{}5\text{ }\text{mm}\text{ }\text{Rb}$ vapor cell.

\mathbf{B}

and the major axis of the light polarization ellipse is along

\mathbf{B}

. When the light modulation frequency matches the Larmor frequency, elliptically polarized light produces a precessing atomic spin orientation transverse to

\mathbf{B}

via synchronous optical pumping. The precessing spin orientation causes optical rotation oscillating at the Larmor frequency by modulating the atomic vapor's circular birefringence. Based on this technique's precision, in situ nature (which avoids systematic errors arising from optical interfaces) and independent control of the most important systematic errors, it is shown that the accuracy of light ellipticity measurements achievable with this technique can exceed that of existing methods by orders of magnitude.

We investigate an all-optical scheme for high-sensitivity measurements of the Earth's scale magnetic field (

B

). The scheme is based on the Bell-Bloom technique with frequency-modulated light. A single elliptically polarized light beam is used both for pumping the alkali-metal atoms and probing Larmor precession of their spins under the external magnetic field. In contrast to many other high-sensitivity magnetometry schemes based on nonlinear polarization rotation of the light, the proposed approach enables the observation of magnetic resonance via changes in the light-beam ellipticity parameter. The approach has been validated in experiments with a vertical-cavity surface-emitting laser, irradiating a

0.125

^3

cesium vapor cell filled with a buffer gas. In the current experimental conditions, the achieved sensitivity is estimated at

220

fT/

\surd

Hz under

B

\,\approx\,

50

μ

T, while the shot-noise floor corresponds to

\approx\,

20

fT/

\surd

Hz. The bandwidth is estimated at

\approx\,

1

kHz. The proposed simple and robust single-beam scheme is well suited for miniaturization and is therefore particularly promising for the development of compact, highly sensitive, low-power-consumption atomic magnetometers for a wide range of applications in the geomagnetic field.