A Polarisation rotation in Rb vapour cell due to laser light with sweeping frequency

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The discussion focuses on the observation of nonlinear intensity increases in output when linearly polarized laser light is passed through a rubidium vapor cell while sweeping the frequency. The external cavity diode laser is tuned to 384.229 Terahertz, and a ramp voltage is applied to the piezo for frequency modulation. The setup includes an analyzer positioned crosswise to the laser light, with detection through a photodiode. The phenomenon may be linked to cyclotron resonance effects, suggesting that the rubidium cell's sensitivity to magnetic fields could play a significant role. The findings highlight the complex interactions between laser frequency sweeps and atomic transitions in rubidium.
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I have an external cavity diode laser source tuned to frequency 384.229 Terahertz. I am applying a ramp voltage of 1volt (peak-to-peak) to piezo so that the frequency sweeps and different hyperfine transitions of rubidium are tuned. Now I have linearly polarised this laser light and passed it through a Rubidium Cell. An analyser is placed in cross position and the output is detected though a photodiode. I am observing a nonlinear increase in intensity of the output when the ramp amplitude is increased. Please explain the phenomenon
 
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Maybe a cyclotron resonance?
 
I believe the Rubidium cell might be very sensitive to magnetic fields.