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\chapter{Hardware} % -----------------------------------------------------------------------------
\section{Adjustable periscopes} % ----------------------------------------------------------------
Our light sources take on horizontal or vertical polarizations according to which tuning process is
used. %
Our experiments are opinionated about polarization, so some strategy for aligning polarization is
necessary. %
Desire fully reflective, easy to switch without changing path length (delay) etc... For several
years, we used brewster-angle polarization unifiers... %
These worked by... %
But these were very difficult to align, and they were too lossy for some of the weaker tuning
processes. %
As an alternative, we designed a more traditional periscope with adjustability for our unique
needs. %
\subsection{Alignment} % -------------------------------------------------------------------------
\begin{enumerate}
\item in flipped polarization:
\begin{itemize}
\item stage near
\item upper mirror far
\end{itemize}
\item in kept polarization:
\begin{itemize}
\item stage x and upper mirror height near
\item lower mirror far
\end{itemize}
\end{enumerate}
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