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Femtotesla atomic magnetometry in a microfabricated vapor cell



William C. Griffith, Svenja A. Knappe, John Kitching


We describe an optically pumped 87Rb magnetometer with 4.5 fT/Hz1/2 sensitivity when operated in the spin-exchange relaxation free (SERF) regime. The magnetometer uses a microfabricated vapor cell, consisting of a cavity etched in a 1 mm thick silicon wafer with anodically bonded pyrex windows. The measurement volume of the magnetometer is 1 mm3, defined by the overlap region of a circularly polarized pump laser, and a linearly polarized probe laser, both operated near 795 nm. Sensitivity limitations unique to the use of microfabricated cells are discussed.
Optics Express


atomic magnetometer, CSAM, microfabricated magnetometer


Griffith, W. , Knappe, S. and Kitching, J. (2010), Femtotesla atomic magnetometry in a microfabricated vapor cell, Optics Express, [online], (Accessed April 24, 2024)
Created December 19, 2010, Updated October 12, 2021