Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

A microfabricated optically-pumped magnetic gradiometer

Published

Author(s)

Abigail R. Perry, Sean P. Krzyzewski, John E. Kitching, S. Geller, Sheng D., Svenja A. Knappe

Abstract

We report on the development of a microfabricated atomic magnetic gradiometer based on optical spectroscopy of alkali atoms in the vapor phase. The gradiometer, with a length of 60 mm and a cross section diameter of 12 mm, is made of two chip-scale atomic magnetometers, which are interrogated by light from a common laser and operate in the spin-exchange relaxation free regime. The sensor can measure differences in magnetic field over a 2 cm baseline of 10 fT/Hz^1/2 at frequencies above 20 Hz. The maximum rejection of magnetic field noise is 1000 at 10 Hz. By use of a set of compensation coils wrapped around the sensor, we also measure the sensor sensitivity at several external bias field strengths up to 150 mG. This device is useful for applications that require both sensitive gradient field information and high common-mode noise cancellation.
Citation
Applied Physics Letters

Keywords

magnetometer, atomic, laser sensors, optical instruments, micro-optical devices

Citation

Perry, A. , Krzyzewski, S. , Kitching, J. , Geller, S. , D., S. and Knappe, S. (2017), A microfabricated optically-pumped magnetic gradiometer, Applied Physics Letters, [online], https://doi.org/10.1063/1.4974349 (Accessed February 24, 2024)
Created January 18, 2017, Updated November 10, 2018