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The Faraday effect is ...  Following Melissinos and Napolitano \cite{Melissinos_2003} pages 204 - 210, we begin by assuming that the shift in polarization of the light $\phi(B)$ passing through a rod of material of length $L$ due to the application of an external co-axial magnetic field $B$ is linearly proportional to the applied magnetic field and the length of the material, so that   \begin{equation}  \phi(B) = c_V B L  \end{equation}  where $c_V$ is a (wavelength-dependent) `constant' known as the Verdet constant. The value of the Verdet constant depends on the type of material and the wavelength of the polarized light.   In our experiment, we measure light intensity by use of a photodiode. A photodiode is a current source with an output that is proportional to the light intensity (unless it saturates), so by placing a $1k\Omega$ resistor across the photodiode terminals and measuring the voltage across the resistor, we have a measure of light intensity.   We did a lot of stuff to ensure we got a linear response, including ....  diff --git a/layout.md b/layout.md  index 13f6324..927b948 100644  --- a/layout.md  +++ b/layout.md 
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Abstract.tex  Introduction.tex  Ordinary text and paragraphs.tex  The_Faraday_effect_is_Following__.tex  Suppose_then_that_the_original__.tex  Note_that_the_sensitivity_eta__.tex  Math symbols.tex