Flat-response spin-exchange relaxation free atomic magnetometer under negative feedback | Zendy

Hyun Joon Lee | Zendy; Jeong Hyun Shim | Zendy; Han Seb Moon | Zendy; Kiwoong Kim | Zendy

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Flat-response spin-exchange relaxation free atomic magnetometer under negative feedback

Author(s) -

Hyun Joon Lee,

Jeong Hyun Shim,

Han Seb Moon,

Kiwoong Kim

Publication year - 2014

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.22.019887

Subject(s) - magnetometer , physics , bandwidth (computing) , relaxation (psychology) , magnetic field , optics , nuclear magnetic resonance , condensed matter physics , atomic physics , quantum mechanics , computer science , psychology , social psychology , computer network

We demonstrate that the use of negative feedback extends the detection bandwidth of an atomic magnetometer in a spin-exchange relaxation free (SERF) regime. A flat-frequency response from zero to 190 Hz was achieved, which is nearly a three-fold enhancement while maintaining sensitivity, 3 fT/Hz1/2 at 100 Hz. With the extension of the bandwidth, the linear correlation between measured signals and a magne-tocardiographic field synthesized for comparison was increased from 0.21 to 0.74. This result supports the feasibility of measuring weak biomagnetic signals containing multiple frequency components using a SERF atomic magnetometer under negative feedback.

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