title: Characterization of a high mechanical-Q fiber laser Lorentz force dc magnetometer.
abstract: A magnetic field sensor is described based on coupling the field into a time varying strain in a fiber laser strain sensor, through the Lorentzian force. A conducting bridge carries an ac current and oscillates at resonance in the presence of a magnetic field. A fiber laser strain sensor attached to the ribbon measures the deflections. The quality factor is shown to be limited by air damping resulting in a measurement resolution of 704 pT/Hz(1/2)±10% at ambient pressure and 360 pT/Hz(1/2)±10% at a reduced pressure of 1700 Pa at 1 Hz and 75 mA (rms).
authors.affiliation: Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375, USA. geoff.cranch@nrl.navy.mil
authors.forename: G A
authors.initials: GA
authors.lastname: Cranch
authors.forename: C G
authors.initials: CG
authors.lastname: Askins
authors.forename: G A
authors.initials: GA
authors.lastname: Miller
authors.forename: C K
authors.initials: CK
authors.lastname: Kirkendall