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Our setup consisted of a HeNe solid state diode  laser with a wavelength of 670 nm, a solenoid with a coil constant of 11.1 mT/A, a rotatable polarizer, and a photodiode. The current through the solenoid was controlled by a programmable bipolar operational power supply to produce either a DC current, AC current, or AC current with a DC offset. This allowed us to produce wither a constant magnetic field $B_0$ or a time varying magnetic field $B = B_0 + B_1 \cos(\omega t)$ as needed.