Dual channel self-oscillating optical magnetometer

Journal Article · Fri May 15 00:00:00 EDT 2009 · Journal of the Optical Society of America. Part B, Optical Physics

DOI:https://doi.org/10.1364/JOSAB.26.000910· OSTI ID:22046818

Belfi, J ^[1]; Bevilacqua, G; Biancalana, V; Dancheva, Y; Khanbekyan, K; Moi, L ^[1]; Cartaleva, S ^[2]

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1. Dipartimento di Fisica, CNISM-Unita di Siena, Centro Studi Sistemi Complessi, Universita di Siena, via Roma 56, 53100 Siena (Italy)
2. Institute of Electronics, Bulgarian Academy of Sciences, Boul. Tsarigradsko Shosse 72, 1784 Sofia (Bulgaria)

We report on a two-channel magnetometer based on nonlinear magneto-optical rotation in a Cs glass cell with buffer gas. The Cs atoms are optically pumped and probed by free running diode lasers tuned to the D{sub 2} line. A wide frequency modulation of the pump laser is used to produce both synchronous Zeeman optical pumping and hyperfine repumping. The magnetometer works in an unshielded environment, and a spurious signal from distant magnetic sources is rejected by means of differential measurement. In this regime the magnetometer simultaneously gives the magnetic field modulus and the field difference. Rejection of the common-mode noise allows for high-resolution magnetometry with a sensitivity of 2 pT/{radical}(Hz). This sensitivity, in conjunction with long-term stability and a large bandwidth, makes it possible to detect water proton magnetization and its free induction decay in a measurement volume of 5 cm{sup 3}.

• OSTI ID: 22046818
• Journal Information: Journal of the Optical Society of America. Part B, Optical Physics, Vol. 26, Issue 5; Other Information: (c) 2009 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA); ISSN 0740-3224
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
CESIUM
FREQUENCY MODULATION
GLASS
INDUCTION
MAGNETIC FIELDS
MAGNETIZATION
MAGNETOMETERS
MAGNETO-OPTICAL EFFECTS
NONLINEAR OPTICS
NONLINEAR PROBLEMS
OPTICAL PUMPING
PHOTON-ATOM COLLISIONS
PROTONS
ROTATION
SEMICONDUCTOR LASERS
SENSITIVITY
WATER
ZEEMAN EFFECT