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Frequency-stabilized improvement of saturated absorption spectroscopy based on laser linewidth-control strategy
Optics Letters
|February 1, 2024
Summary
Frequency stabilization of 1083 nm single-frequency fiber lasers (SFFLs) was improved by matching laser linewidth to saturated absorption error signals. This enhances sensitivity and accuracy in helium-4 optical pumping magnetometers (OPMs).
Area of Science:
- Atomic, Molecular, and Optical Physics
- Laser Spectroscopy
- Magnetometry
Background:
- Single-frequency fiber lasers (SFFLs) at 1083 nm are crucial for helium-4 optical pumping magnetometers (OPMs).
- OPM sensitivity and accuracy are fundamentally limited by the frequency stability of the SFFLs used.
Purpose of the Study:
- To enhance the frequency stabilization of 1083 nm SFFLs.
- To improve the performance of helium-4 OPMs by increasing laser frequency stability.
Main Methods:
- Externally tailored the laser linewidth of 1083 nm SFFLs.
- Matched the laser linewidth to the spectral width of the error signal in saturated absorption spectroscopy.
- Generated a high-intensity error signal using a large number of 4He atoms interacting with the laser.
Main Results:
- Successfully improved the frequency-stabilized performance of 1083 nm SFFLs.
- Reduced the root mean square value of frequency fluctuation from 24.6 kHz to 13.6 kHz after locking.
- Achieved a 44.7% performance improvement in frequency stabilization.
Conclusions:
- The developed strategy effectively enhances SFFL frequency stability for OPM applications.
- This method provides a technical foundation for high-precision absolute frequency stabilization using atomic absorption spectroscopy.
- The findings are applicable to improving magnetic field detection sensitivity and accuracy in OPMs.
