研究目的
To propose a transverse relaxation determination method for spin-exchange relaxation free (SERF) magnetometer based on polarization modulation technique, aiming for a more accurate measurement compared to traditional methods.
研究成果
The light polarization modulation method demonstrates feasibility and offers better measurement precision for SERF magnetometer's transverse relaxation, overcoming the instability of the light intensity excitation method in low-frequency ranges.
研究不足
The noise of the liquid crystal modulator, with a response time on the order of ms, limits the modulation precision.
1：Experimental Design and Method Selection:
Utilizes a liquid crystal modulator to modulate the pump light polarization instead of the light intensity, deriving a resonance model for linewidth determination.
2：Sample Selection and Data Sources:
A glass cell containing potassium (K), nitrogen (N2), and helium (He) buffer gas is used as the sensitive unit.
3：List of Experimental Equipment and Materials:
Includes DFB diode lasers, liquid crystal phase modulator, photodiode, lock-in amplifiers, and a set of four-layer μ-metal magnetic shields.
4：Experimental Procedures and Operational Workflow:
The pump beam polarization is modulated, and the probe beam's polarization changes are measured using Faraday modulation technique.
5：Data Analysis Methods:
The optical rotation is extracted from the first harmonic of the Faraday modulation frequency, and the atomic spin magnetic resonance signal is deduced from the first harmonic of the liquid crystal phase modulator modulation frequency.
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