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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 10 — Apr. 1, 2014
  • pp: 2158–2162

Loop-locked coherent population trapping magnetometer based on a fiber electro-optic modulator

Yong Hu, Y. Y. Feng, Chi Xu, H. B. Xue, and Li Sun  »View Author Affiliations


Applied Optics, Vol. 53, Issue 10, pp. 2158-2162 (2014)
http://dx.doi.org/10.1364/AO.53.002158


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Abstract

We have set up a coherent population trapping (CPT)-based magnetometer prototype with the D1 line of Rb87 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 8pT/Hz in a parallel B field.

© 2014 Optical Society of America

OCIS Codes
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(020.1670) Atomic and molecular physics : Coherent optical effects
(040.0040) Detectors : Detectors
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(230.2090) Optical devices : Electro-optical devices

ToC Category:
Atomic and Molecular Physics

History
Original Manuscript: December 18, 2013
Revised Manuscript: February 24, 2014
Manuscript Accepted: February 26, 2014
Published: March 28, 2014

Citation
Yong Hu, Y. Y. Feng, Chi Xu, H. B. Xue, and Li Sun, "Loop-locked coherent population trapping magnetometer based on a fiber electro-optic modulator," Appl. Opt. 53, 2158-2162 (2014)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-53-10-2158


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