A compact fiberized alkali-vapor atomic magnetometer

Alkali-vapor atomic magnetometers are among the world's most sensitive magnetic-field measuring devices, with demonstrated precisions [1] better than $1 \textrm{fT}/\sqrt{\textrm{Hz}}$ when operated in the SERF regime. All-optical magnetometers operating at finite fields require synchronous optical pumping to reinforce the precessing atomic spin polarization. Here describe a synchronously pumped magnetometer in which the vapor cell is coupled to the pump and probe optics solely by optical fibers. Tests of this device at finite field ($\sim$10 mG) and at Earth's field will be presented.\\[4pt] [1] H.~B.~Dang, A.~C.~Maloof, and M.~V.~Romalis, Appl. Phys. Lett. \textbf{97}(15), 151110.