Abstract

We present encouraging results obtained with an experimental apparatus based on coherent population trapping and aimed at detecting a biological (cardiac) magnetic field in a magnetically compensated but unshielded volume. The work includes magnetic-field and magnetic-field-gradient compensation and uses differential detection to cancel common mode magnetic noise. Synchronous data acquisition with a reference (electrocardiographic or pulse-oximetric) signal makes possible improvement of the signal-to-noise ratio in off-line averaging. The setup has the significant advantages of working at room temperature with a small-size head, and the possibility of fast adjustments of the dc bias magnetic field, which makes the sensor suitable for detecting a biomagnetic signal at any orientation with respect to the axis of the head and in any position on the patient's chest, which is not the case with other kinds of magnetometers.

© 2007 Optical Society of America

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2007 (2)

2006 (3)

V. Acosta, M. P. Ledbetter, S. M. Rochester, and D. Budker, "Nonlinear magneto-optical rotation with frequency-modulated light in the geophysical field range," Phys. Rev. A 73, 053404 (2006).
[CrossRef]

S. Groeger, G. Bison, J.-L. Schenker, R. Wynands, and A. Weis, "A high-sensitivity laser-pumped Mx magnetometer," Eur. Phys. J. D 38, 239-247 (2006).
[CrossRef]

H. Xia, A. Ben-Amar Baranga, D. Hoffman, and M. V. Romalis, "Magnetoencephalography with an atomic magnetometer," Appl. Phys. Lett. 89, 211104 (2006).
[CrossRef]

2004 (1)

S. J. Seltzer and M. Romalis, "Unshielded three axis vector operation of a spin-exchange-relaxation-free atomic magnetometer," Appl. Phys. Lett. 85, 4804-4806 (2004).
[CrossRef]

2003 (3)

C. Andreeva, G. Bevilacqua, V. Biancalana, S. Cartaleva. Y. Dancheva, T. Karaulanov, C. Marinelli, E. Mariotti, and L. Moi, "Two-color coherent population trapping in a single Cs hyperfine transition, with application in magnetometry," Appl. Phys. B 76, 667-675 (2003).

G. Bison, R. Wynands, and A. Weis, "A laser-pumped magnetometer for the mapping of human cardiomagnetic fields," Appl. Phys. B 76, 325-328 (2003).
[CrossRef]

G. Bison, R. Wynands, and A. Weis, "Dynamical mapping of the human cardiomagnetic field with a room-temperature, laser-optical sensor," Opt. Express 11, 904-909 (2003).

2002 (4)

D. Budker, D. F. Kimball, V. V. Yashchuk, and M. Zolotorev, "Nonlinear magneto-optical rotation with frequency-modulated light," Phys. Rev. A 65, 055403 (2002).
[CrossRef]

C. Affolderbach, M. Stahler, S. Knappe, and R. Wynands, "An all-optical, high-sensitivity magnetic gradiometer," Appl. Phys. B 75, 605-612 (2002).
[CrossRef]

D. Budker, W. Gawlik, D. F. Kimball. M. Rochester, V. V. Yashchuk, and A. Weis, "Resonant nonlinear magneto-optical effect in atoms," Rev. Mod. Phys. 74, 1154-1210 (2002).

J. Allred, R. Lyman, T. Kornack, and M. Romalis, "A high-sensitivity atomic magnetometer unaffected by spin-exchange relaxation," Phys. Rev. Lett. 89, 130801 (2002).
[CrossRef]

1999 (1)

R. Wynands and A. Nagel, "Precision spectroscopy with coherent dark states," Appl. Phys. B 68, 1-25 (1999).
[CrossRef]

1969 (1)

J. Dupont-Roc, S. Haroche, and C. Cohen-Tannoudji, "Detection of very weak magnetic fields (10−9 gauss) by 87Rb-zero-field level crossing resonances," Phys. Lett. 28A, 638-639 (1969).
[CrossRef]

1962 (1)

Appl. Opt. (1)

Appl. Phys. B (4)

C. Affolderbach, M. Stahler, S. Knappe, and R. Wynands, "An all-optical, high-sensitivity magnetic gradiometer," Appl. Phys. B 75, 605-612 (2002).
[CrossRef]

G. Bison, R. Wynands, and A. Weis, "A laser-pumped magnetometer for the mapping of human cardiomagnetic fields," Appl. Phys. B 76, 325-328 (2003).
[CrossRef]

C. Andreeva, G. Bevilacqua, V. Biancalana, S. Cartaleva. Y. Dancheva, T. Karaulanov, C. Marinelli, E. Mariotti, and L. Moi, "Two-color coherent population trapping in a single Cs hyperfine transition, with application in magnetometry," Appl. Phys. B 76, 667-675 (2003).

R. Wynands and A. Nagel, "Precision spectroscopy with coherent dark states," Appl. Phys. B 68, 1-25 (1999).
[CrossRef]

Appl. Phys. Lett. (2)

H. Xia, A. Ben-Amar Baranga, D. Hoffman, and M. V. Romalis, "Magnetoencephalography with an atomic magnetometer," Appl. Phys. Lett. 89, 211104 (2006).
[CrossRef]

S. J. Seltzer and M. Romalis, "Unshielded three axis vector operation of a spin-exchange-relaxation-free atomic magnetometer," Appl. Phys. Lett. 85, 4804-4806 (2004).
[CrossRef]

Eur. Phys. J. D (1)

S. Groeger, G. Bison, J.-L. Schenker, R. Wynands, and A. Weis, "A high-sensitivity laser-pumped Mx magnetometer," Eur. Phys. J. D 38, 239-247 (2006).
[CrossRef]

J. Opt. Soc. Am. B (1)

Nature (1)

D. Budker and M. Romalis, "Optical magnetometry," Nature 3, 227-234 (2007).

Opt. Express (1)

Phys. Lett. (1)

J. Dupont-Roc, S. Haroche, and C. Cohen-Tannoudji, "Detection of very weak magnetic fields (10−9 gauss) by 87Rb-zero-field level crossing resonances," Phys. Lett. 28A, 638-639 (1969).
[CrossRef]

Phys. Rev. A (2)

D. Budker, D. F. Kimball, V. V. Yashchuk, and M. Zolotorev, "Nonlinear magneto-optical rotation with frequency-modulated light," Phys. Rev. A 65, 055403 (2002).
[CrossRef]

V. Acosta, M. P. Ledbetter, S. M. Rochester, and D. Budker, "Nonlinear magneto-optical rotation with frequency-modulated light in the geophysical field range," Phys. Rev. A 73, 053404 (2006).
[CrossRef]

Phys. Rev. Lett. (1)

J. Allred, R. Lyman, T. Kornack, and M. Romalis, "A high-sensitivity atomic magnetometer unaffected by spin-exchange relaxation," Phys. Rev. Lett. 89, 130801 (2002).
[CrossRef]

Rev. Mod. Phys. (1)

D. Budker, W. Gawlik, D. F. Kimball. M. Rochester, V. V. Yashchuk, and A. Weis, "Resonant nonlinear magneto-optical effect in atoms," Rev. Mod. Phys. 74, 1154-1210 (2002).

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