title: Femtotesla atomic magnetometry in a microfabricated vapor cell.
abstract: We describe an optically pumped 87Rb magnetometer with 5 fT/Hz(1/2) 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.
authors.affiliation: Time and Frequency Division, National Institute of Standards and Technology, Boulder, Colorado 80305, USA. wclarkg@gmail.com
authors.forename: W Clark
authors.initials: WC
authors.lastname: Griffith
authors.forename: Svenja
authors.initials: S
authors.lastname: Knappe
authors.forename: John
authors.initials: J
authors.lastname: Kitching
mesh_terms: D004574:Electromagnetic Fields; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D008280:Magnetics / Q000295:instrumentation*; D008904:Miniaturization