Article

Abstract

• A multichannel imaging system is presented, consisting of 25 microfabricated optically-pumped magnetometers. The sensor probes have a footprint of less than 1 cm² and a sensitive volume of 1.5 mm × 1.5 mm × 1.5 mm and connect to a control unit through optical fibers of length 5 m. Operating at very low ambient magnetic fields, the sensor array has an average magnetic sensitivity of 24 fT/Hz^1/2, with a standard deviation of 5 fT/Hz^1/2 when the noise of each sensor is averaged between 10 and 50 Hz. Operating in Earth's magnetic field, the magnetometers have a field sensitivity around 5 pT/Hz^1/2. The vacuum-packaged sensor heads are optically heated and consume on average 76 ± 7 mW of power each. The heating power is provided by an array of eight diode lasers. Magnetic field imaging of small probe coils was obtained with the sensor array and fits to the expected field pattern agree well with the measured data.

Creator

• Mhaskar, Rahul
• Trahms, Lutz
• Jiménez-Martínez, Ricardo
• Alem, Orang
• Knappe, Svenja
• Sander, Tilmann
• Sheng, Dong
• Kitching, John
• LeBlanc, John

Date Issued

• 2017-04-03

Academic Affiliation

• Mechanical Engineering

Journal Title

• Optics Express

Journal Issue/Number

• 7

Journal Volume

• 25

File Extent

• 7849-7858

Subject

• Laser sensors
• atomic
• Micro-optical devices
• Optical instruments
• Spectroscopy

Publisher

• Optical Society of America

Last Modified

• 2020-02-11

Identifier

• PubMed ID: 28380903

Resource Type

• Article

Rights Statement

• In Copyright

DOI

•  https://doi.org/10.1364/OE.25.007849

ISSN

• 1094-4087

Language

• English [eng]

Relationships

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