Laser magnetometry in fundamental science and in biomagnetic applications

Antoine Weis; Georg Bison; Stephan Groeger; Robert Wynands

doi:10.1117/12.617407

22 April 2005 Laser magnetometry in fundamental science and in biomagnetic applications (Invited Paper)

Antoine Weis, Georg Bison, Stephan Groeger, Robert Wynands

Proceedings Volume 5830, 13th International School on Quantum Electronics: Laser Physics and Applications; (2005) https://doi.org/10.1117/12.617407
Event: 13th International School on Quantum Electronics: Laser Physics and Applications, 2004, Bourgas, Bulgaria

Abstract

Laser-pumped cesium magnetometers allow highly sensitive small field magnetometry at room temperature. We report on applications of that technique in biomagnetic diagnostics and in a new experiment searching for a neutron electric dipole moment (nEDM) experiment. In the biomagnetic application the magnetiv field from the beating human heart is detected using a gradiometer which reaches an intrinsic sensitvity of 80 fT/Hz^1/2 with a spatial resolution of 28 mm. The device can record time-resolved magnetic field maps above the human body surface and its performance is comparable to devices based on Hi-T_c-SQUID (superconducting quantum interference device) technology. In the nEDM experiment laser-pumped cesium magnetometers will be used to measure and stabilize a DC magnetic field of 2μT and to generate the oscillating filed for the neutron Ramsey resonance. Those devices reach an intrinsic sensitivity of about 14 fT/Hz^1/2 with a measurement bandwidth of 1kHz. The general principle of operation and specific results are presented.

Citation Download Citation

Antoine Weis, Georg Bison, Stephan Groeger, and Robert Wynands "Laser magnetometry in fundamental science and in biomagnetic applications (Invited Paper)", Proc. SPIE 5830, 13th International School on Quantum Electronics: Laser Physics and Applications, (22 April 2005); https://doi.org/10.1117/12.617407

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