All optical sensor for automated magnetometry based on Coherent Population Trapping

Details All optical sensor for automated magnetometry based on Coherent Population Trapping All optical sensor for automated magnetometry based on Coherent Population Trapping

2007-05-11

arxiv.org/abs/0705.1671v1

Physics

Atomic Physics

8 pages, 10 figures, appearing in JOSA B (7?) 2007

Scientific paper

10.1364/JOSAB.24.001482

An automated magnetometer suitable for long lasting measurement under stable and controllable experimental conditions has been implemented. The device is based on Coherent Population Trapping (CPT) produced by a multi-frequency excitation. CPT resonance is observed when a frequency comb, generated by diode laser current modulation, excites Cs atoms confined in a $\pi/4\times(2.5)^2\times1 \textrm{cm}^3$, 2 Torr $N_2$ buffered cell. A fully optical sensor is connected through an optical fiber to the laser head allowing for truly remote sensing and minimization of the field perturbation. A detailed analysis of the CPT resonance parameters as a function of the optical detuning has been made in order to get high sensitivity measurements. The magnetic field monitoring performances and the best sensitivity obtained in a balanced differential configuration of the sensor are presented.

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