structure

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diff --git a/hardware/auto/chapter.el b/hardware/auto/chapter.el
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+(TeX-add-style-hook
+ "chapter"
+ (lambda ()
+   (LaTeX-add-labels
+    "f:periscope"))
+ :latex)
+
diff --git a/hardware/chapter.tex b/hardware/chapter.tex
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+\chapter{Hardware}  % -----------------------------------------------------------------------------

+

+In this chapter I collect some of the specific hardware contribution details that do not belong in

+the body of the dissertation.  %

+

+\section{Adjustable periscopes}  % ----------------------------------------------------------------

+

+OPAs output 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.  % TODO: cite opinionated about polarization

+In addition, it is useful to bring all excitation beams to the same height.  %

+To this end, I designed and constructed two adjustable periscopes.  %

+Each periscope is designed to bring OPA output to table height standard (5 inches) while either

+keeping or switching polarization.  %

+Both polarization configurations take the same path length, so source polarization can be switched

+without large changes to zero delay.  %

+All of this is done with just two (switched polarization) or three (kept polarzation)

+reflections.  %

+A picture of these periscopes is shown in \ref{f:periscope}.  %

+

+\begin{figure}[htp!]

+	\centering

+	\includegraphics[width=\textwidth]{"hardware/periscope"}

+	\label{f:periscope}

+	\caption{CAPTION TODO}

+\end{figure}

+

+While these periscopes are easy to align, their unique design means that it is not necessarily

+obvious what the correct strategy is.  %

+The following strategy will always converge:

+\begin{enumerate}

+  \item use two ``magic'' apertures along the output beamline

+  \item in flipped polarization (two mirror configuration):

+    \begin{itemize}

+      \item use the stage (green X, Y) to align near aperture

+      \item use the upper mirror (yellow TA, TB) to align far aperture

+      \item iterate above

+    \end{itemize}

+  \item in kept polarization (three mirror configuration):

+    \begin{itemize}

+      \item use stage X (green X) and upper mirror height (yellow TC) to align near aperture

+      \item use lower mirror (pink SA, SB) to align far aperture

+      \item iterate above

+    \end{itemize}

+\end{enumerate}

+The kept polarization alignment is derivative of the fixed polarization alignment.  %

+One must ensure that the fixed polarization is correctly aligned at all times.  %

+  

+Mirror B (aqua) is magnetically mounted to switch between polarization conditions.  %

+Ensure that the lower turning mirror (pink) does not bump into mirror B (aqua) in polarization

+swtiching configuration.  %

+The lower turning mirror is on a rail (pink SC).  %

+This rail is a rough adjust for the same degree of freedom as pink SA.  %

+Adjust the rail only to ensure that the beam is roughly centered on the free aperture of the

+turning mirror.  %

+

+The first reflection is often accomplished using a wedge, as OPA output may be strong enough to

+damage downstream optics.  %

+This optic can and should be replaced if more of the OPA output is desired on the table (keeping

+damage thresholds in mind).  %

+

+\subsection{Wedge polarization preference}

+

+TODO: wedges will be more efficent at reflecting horizontal / vertical at 45 degrees

+

+\section{Automated transmissive filters}  % -------------------------------------------------------

+

+TODO

+

+\section{Electronics}  % --------------------------------------------------------------------------

+

+TODO
\ No newline at end of file