From 4387f96aef0dcafbbce06e76cf19224537d98772 Mon Sep 17 00:00:00 2001
From: Blaise Thompson <blaise@untzag.com>
Date: Mon, 16 Oct 2017 08:54:52 -0500
Subject: adjustable periscopes

---
 appendix/hardware.tex | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

(limited to 'appendix/hardware.tex')

diff --git a/appendix/hardware.tex b/appendix/hardware.tex
index 7a0f409..c69d7e9 100644
--- a/appendix/hardware.tex
+++ b/appendix/hardware.tex
@@ -1 +1,34 @@
-\chapter{Hardware}
+\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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