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Femtotesla atomic magnetometry in a microfabricated vapor cell



William C. Griffith, Svenja A. Knappe, John E. 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
Created December 20, 2010, Updated February 19, 2017