Fig. 1. Experimental setup of the SERF magnetometer for independent single-beam mode and double-beam mode operation. PMF, polarization maintaining fiber; OFC, optical fiber collimator; LP, linear polarizer; QWP, quarter-wave plate; PD, photodiode; HWP, half-wave plate; PBS, polarizing-beam splitter; TIA, transimpedance amplifier; LIA, lock-in amplifier; Ref, reference signal; DAQ, data acquisition.

Fig. 2. Response signal versus (a) frequency detuning of probe light, (b) light intensity of probe light, (c) frequency detuning of pump light, and (d) light intensity of pump light.

Fig. 3. Response signal as a function of temperature at the optimal optical parameters.

Fig. 4. Sensitivity of the SERF magnetometer. The probe noise is recorded by blocking the pump light and turning on the probe light. The electronic noise is recorded by blocking the pump light and probe light.

Fig. 5. Frequency response of the 100 pT rms calibrated magnetic field at frequency of 1–200 Hz and fitting curve in the single-beam mode and double-beam mode, respectively.