A Remotely Interrogated All-Optical ${}^{87}$Rb Magnetometer

Abstract

Atomic magnetometry was performed at Earth's magnetic field over a free-space distance of ten meters. Two laser beams aimed at a distant alkali-vapor cell excited and detected the ${}^{87}$Rb magnetic resonance, allowing the magnetic field within the cell to be interrogated remotely. Operated as a driven oscillator, the magnetometer measured the geomagnetic field with \lessgtrsim{\lesssim}3.5\,pT precision in a $\sim$2\,s data acquisition; this precision was likely limited by ambient field fluctuations. The sensor was also operated in self-oscillating mode with a 5.3\,pT/$\sqrt{\text{Hz}}$ noise floor. Further optimization will yield a high-bandwidth, fully remote magnetometer with sub-pT sensitivity.

Accepted to Appl. Phys. Lett.; 3 pages, 3 figures

References in corpus (3)

• Robust, High-speed, All-Optical Atomic Magnetometer
• Nonlinear magneto-optical rotation with modulated light in tilted magnetic fields
• Tailoring quantum superpositions with linearly polarized amplitude-modulated light

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