We demonstrate a scalar 87Rb optical magnetometer that retains magnetic eld sensitivities below 10 pT/√Hz over 3dB bandwidths of 10 kHz in an ambient eld Bo = 11.4 microT and using a measurement volume of 1 mm3. The magnetometer operates at high atomic densities where both the sensitivity and bandwidth are limited by spin-exchange collisions between the alkali atoms. By operating in this regime our measurements show that the bandwidth of the magnetometer can be increased without a significant degradation in its sensitivity. The projected photon shot noise-limited sensitivity for the experimental parameters is 1 pT/√Hz, while the fundamental atom shot noise limit is 150 fT/√Hz.
Citation: The Journal of Optical Society of America B
Pub Type: Journals
Laser spectroscopy, Optical magnetometry, Optical pumping