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A microfabricated optically-pumped magnetic gradiometer.

D Sheng, A R Perry, S P Krzyzewski

  • 1Time and Frequency Division, National Institute of Standards and Technology , 325 Broadway, Boulder, Colorado 80305, USA.

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Summary
This summary is machine-generated.

We developed a microfabricated atomic magnetic gradiometer using optical spectroscopy. This device precisely measures magnetic field differences with high noise cancellation, useful for sensitive applications.

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Area of Science:

  • Atomic physics
  • Quantum sensing
  • Microfabrication

Background:

  • Atomic magnetometers offer high sensitivity for magnetic field measurements.
  • Gradiometers are crucial for detecting localized magnetic field variations and rejecting common-mode noise.
  • Microfabrication enables miniaturization and integration of atomic sensors.

Purpose of the Study:

  • To develop a microfabricated atomic magnetic gradiometer.
  • To achieve high sensitivity and common-mode noise rejection.
  • To explore applications requiring precise gradient field measurements.

Main Methods:

  • Utilized optical spectroscopy of alkali atoms in the vapor phase.
  • Employed a spin-exchange relaxation free (SERF) operation regime.
  • Integrated two chip-scale atomic magnetometers interrogated by a common laser.

Main Results:

  • Achieved a sensor baseline of 20 mm.
  • Measured magnetic field differences down to 10 fT/Hz at frequencies above 20 Hz.
  • Demonstrated maximum magnetic field noise rejection of 1000 at 10 Hz.
  • Evaluated sensor sensitivity up to 150 mG bias fields.

Conclusions:

  • The microfabricated atomic magnetic gradiometer provides sensitive gradient measurements.
  • The device exhibits excellent common-mode noise cancellation capabilities.
  • Suitable for applications demanding high-precision magnetic field gradient detection.