| Issue |
Europhys. Lett.
Volume 54, Number 3, May 2001
|
|
|---|---|---|
| Page(s) | 323 - 328 | |
| Section | Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics | |
| DOI | https://doi.org/10.1209/epl/i2001-00245-y | |
| Published online | 01 December 2003 | |
Picotesla magnetometry with coherent dark states
Institut für Angewandte Physik der Universität Bonn
Wegelerstr. 8, D-53115 Bonn, Germany
Received:
20
November
2000
Accepted:
16
February
2001
We investigate the experimental sensitivity limit of a scalar optical
magnetometer based on coherent population trapping on the D2 line of
a thermal cesium vapor. We find the expected strong dependence on
averaging time, with a detection limit below 4 pT for integration times
longer than 1 s, limited by slow drifts of the cell temperature and of
the applied test magnetic-field itself. A detailed noise analysis shows
that for shorter averaging times the
demonstrated limit of about 12 pT/
is dominated by the
frequency noise of the laser source. The magnetometer can be operated
for real-time detection in flux densities up to at least milliteslas and
is robust enough for application outside the laser laboratory.
PACS: 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light / 32.70.Jz – Line shapes, widths, and shifts / 07.55.Ge – Magnetometers for magnetic field measurements
© EDP Sciences, 2001
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