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Lena/Nov 2016: Difference between revisions
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→Optical frequency dependence
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Measured how the magnetic field change depends on the optical frequency of the pump laser. The pump current is modulated with a sum of two waveforms - 0.1 Hz ramp that sweeps through the optical frequency, and 38 Hz harmonic modulation that changed the optical frequency by 1 GHz. We connected the magnetometer signal to the lock-in to see how both phase and amplitude depend on the optical frequency.
We observed response in both X and Y channels of the lock-in. The X response remained positive, and changed by 20-50%. The Y response was an 10 times smaller than the X response, and changed sign as the optical frequency changed. The pump is parallel to the Z direction and orthogonal to the probe. It appears that the measured magnetic field noise has contributions both from the changes in atomic polarization and light shifts, but the light shifts contributions are an order of magnitude smaller.
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