Measurement of Faraday Rotation in SF57 glass at 670 nm


We performed an experiment to measure the Faraday rotation of polarized light passing through a magnetic field, as well as measuring the Verdet constant of an SF57 glass tube with a length of 0.1 m. Our results are consistent with the general idea of Faraday rotation, which suggests that linearly polarized light experiences rotation when applying a magnetic field. The values we found for the Verdet constant are \(20.7 \pm 0.845 \frac{radians}{T \cdot m}\), \(21.095\pm 4.12 \frac{radians}{T \cdot m}\) and \(20.43 \pm 0.058 \frac{radians}{T \cdot m}\), and those values are consistent with each other within uncertainty.


1. To observe Faraday effect in this lab, which says that the rotation of plane of polarization of light changes when applying a magnetic field: \[%\label{} I=I_{0}cos^{2}(\theta_1−\theta_0)\] where \(I_{0}\) is the intensity of the light after passing through the first polarizer and I is the light intensity passing through both polarizers at angles \(\theta_{1}\) and \(\theta_{0}\).

2.To experimentally determine the Verdet constant of a tube made of SF57 glass, which describes the strength of Faraday effect within the glass tube: \[\varphi_{B}=C_{v}BL\] where \(\varphi\) is the shift in polarization, B is the strength of applied magnetic field and L is the length of the glass tube. The magnetic field causes a change in polarization, and measuring the Verdet constant of the glass tells us how much change in polarization there was within the glass due to the magnetic field.