Abstract

We have set up a coherent population trapping (CPT)-based magnetometer prototype with the D1 line of ${}^{87}\mathrm{Rb}$ atoms. The dichromatic light field is derived from a fiber electro-optic modulator (FEOM) connected to an external cavity laser diode. A CPT resonance signal with a 516 Hz linewidth is observed. By feeding back the derivative of the resonance curve to the FEOM with a proportional integral controller, of which the voltage output is directly converted to the measured magnetic field intensity, the resonance peak is locked to the environmental magnetic field. The measurement data we have achieved are well matched with the data measured by a commercial fluxgate magnetometer within 2 nT, and the sensitivity is better than $8\mathrm{pT}/\sqrt{\mathrm{Hz}}$ in a parallel B field.

© 2014 Optical Society of America

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