title: An atomic magnetometer with autonomous frequency stabilization and large dynamic range.
abstract: The operation of a highly sensitive atomic magnetometer using elliptically polarized resonant light is demonstrated. It is based on measurement of zero magnetic field resonance in degenerate two level systems using polarimetric detection. The transmitted light through the polarimeter is used for laser frequency stabilization, whereas reflected light is used for magnetic field measurement. Thus, the experimental geometry allows autonomous frequency stabilization of the laser frequency leading to compact operation of the overall device and has a preliminary sensitivity of <10 pT/Hz(1/2) @ 1 Hz. Additionally, the dynamic range of the device is improved by feedback controlling the bias magnetic field without compromising on its sensitivity.
authors.affiliation: Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 85, India.
authors.forename: S
authors.initials: S
authors.lastname: Pradhan
authors.affiliation: Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 85, India.
authors.forename: S
authors.initials: S
authors.lastname: Mishra
authors.affiliation: Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 85, India.
authors.forename: R
authors.initials: R
authors.lastname: Behera
authors.affiliation: Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 85, India.
authors.lastname: Poornima
authors.affiliation: Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 85, India.
authors.forename: K
authors.initials: K
authors.lastname: Dasgupta