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An atomic magnetometer with autonomous frequency stabilization and large dynamic range
S Pradhan1, S Mishra1, R Behera1
1Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 85, India.
The Review of Scientific Instruments
|July 3, 2015
Summary
This study demonstrates a highly sensitive atomic magnetometer using polarized light for precise magnetic field measurements. The device achieves excellent sensitivity and an improved dynamic range for compact operation.
Area of Science:
- Atomic physics
- Quantum optics
- Magnetometry
Background:
- Atomic magnetometers offer high sensitivity for magnetic field detection.
- Previous designs often require complex laser frequency stabilization systems.
Purpose of the Study:
- To demonstrate a compact and highly sensitive atomic magnetometer.
- To improve the dynamic range of atomic magnetometers without sacrificing sensitivity.
Main Methods:
- Utilizing elliptically polarized resonant light for measurements.
- Employing polarimetric detection of zero magnetic field resonance in two-level systems.
- Implementing autonomous laser frequency stabilization using transmitted light and magnetic field measurement with reflected light.
Main Results:
- Demonstrated a preliminary sensitivity of less than 10 pT/Hz(1/2) @ 1 Hz.
- Achieved autonomous laser frequency stabilization for compact device operation.
- Enhanced the dynamic range through feedback control of the bias magnetic field.
Conclusions:
- The developed atomic magnetometer is highly sensitive and compact.
- The integrated frequency stabilization and dynamic range enhancement offer practical advantages for magnetic field sensing applications.
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