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Proceedings Paper

All optical automated magnetic field monitoring based on coherent population trapping produced by a frequency-modulated diode laser
Author(s): J. Belfi; G. Bevilacqua; V. Biancalana; Y. Dancheva; L. Moi
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Paper Abstract

A fully 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) effect produced by a multi-frequency excitation. It has an all optical sensor connected only by an optical fiber to the laser head. This allows truly remote sensing and minimization of the field perturbation. The CPT resonance is observed when a frequency comb, generated by a diode laser current modulation, excites a sample of Cs atoms confined in a cell with 2 Torr of buffer gas. In differential sensor configuration, allowing for common-mode noise cancellation, the sensitivity of 45pT/square root of Hz is obtained.

Paper Details

Date Published: 5 March 2007
PDF: 5 pages
Proc. SPIE 6604, 14th International School on Quantum Electronics: Laser Physics and Applications, 66040A (5 March 2007); doi: 10.1117/12.726807
Show Author Affiliations
J. Belfi, Univ. di Siena (Italy)
G. Bevilacqua, Univ. di Siena (Italy)
V. Biancalana, Univ. di Siena (Italy)
Y. Dancheva, Univ. di Siena (Italy)
L. Moi, Univ. di Siena (Italy)


Published in SPIE Proceedings Vol. 6604:
14th International School on Quantum Electronics: Laser Physics and Applications

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