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arXiv · 0705.1671

All optical sensor for automated magnetometry based on Coherent Population Trapping

J. Belfi·G. Bevilacqua·V. Biancalana·Y. Dancheva·L. Moi
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Abstract

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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J. Belfi, G. Bevilacqua, V. Biancalana, Y. Dancheva, L. Moi. 2007-05-11. All optical sensor for automated magnetometry based on Coherent Population Trapping. https://doi.org/10.1364/josab.24.001482

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