Detection of radio-frequency magnetic fields using nonlinear magneto-optical rotation

Abstract

We describe a room-temperature alkali-metal atomic magnetometer for detection of small, high frequency magnetic fields. The magnetometer operates by detecting optical rotation due to the precession of an aligned ground state in the presence of a small oscillating magnetic field. The resonance frequency of the magnetometer can be adjusted to any desired value by tuning the bias magnetic field. We demonstrate a sensitivity of 100 pG/ √ Hz (RMS) in a 3.5 cm diameter, paraffin coated cell. Based on detection at the photon shot-noise limit, we project a sensitivity of 20 pG/ √ Hz (RMS).

Optical Fibre Current Sensor for Electric Power Industry

“…1). This solution is based on the Faraday effect, which is the most often applied magneto-optical effect in this kind of sensors [3,4].…”

“…Optical sensors of the magnetic field make use of magneto-optical phenomena, and information about the measured quantity is concealed in the parameters of the light beam propagating in the optical medium [1][2][3][4][5]. Solutions of this kind are of enormous interest for those dealing with electrical power metrology, because due to their non-electricity they are absolutely safe, permit to reduce considerably the dimensions of the sensor, need not be cooled down and are not subjected to electromagnetic disturbances [6,7].…”

Numerical Investigation of the Photonic-Crystal Fibres with Suspended Core

“…The question arises whether in photonic-crystal fibres with a suspended core electrooptical and magnetooptical phenomena can be investigated [9][10][11][12][13][14][15]. This would require the interaction of the optical energy, leaking out from the core, with molecules of the gaseous medium supplied to the air holes.…”

Optical Fibre Magnetic Field Sensors for Monitoring οf the State of Work of Electric Motors

“…The Department of Optoelectronics at the Silesian University of Technology in Gliwice, Poland and the Electrotechnical Institute in Warsaw have been cooperating for elaboration of a measuring system of magnetic field inside direct-current motors based on a magnetooptic effect [6][7][8][9][10][11][12][13][14]. Such kind of system consists of an optical sensor, in which changes of a state of polarization (SOP) of an electromagnetic wave result from changes of the * corresponding author; e-mail: kamil.barczak@polsl.pl intensity of magnetic field.…”