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\subsection{Direct Fit Method}  We plott the photodiode voltage versus angle of the polarizer with and without a magnetic field applied as shown in figure  \ref{fig:directmethoddata}. It can be seen from the graph that the curve shifts a little bit, which is a direct result of the magnetic field. By applying curve fit to our data points, we find the phase shift between two curves is 4 degrees($d\theta$). The current provided to induce a magnetic field is -3A, which can be translated to dB using \ref{magneticfield}. With these numbers, we are able to calculate Verdet constant using: \begin{equation}  c_v=\frac{1}{L}\frac{d\theta}{dB}  \end{equation}