\chapter{Transient grating} \label{cha:trg}

Triply Electronically Enhanced (TrEE) spectroscopy has become the workhorse homodyne-detected 4WM
experiment in the Wright Group.  %

% TODO: On and off-diagonal TrEE pathways

% TODO: Discussion of old and current delay space

% TODO: discuss current delay space physical conventions (see inbox)

\begin{figure}
  \includegraphics[scale=1]{"spectroscopy/wmels/trive_on_diagonal"}
  \caption[CAPTION TODO]{
    CAPTION TODO
  }
  \label{spc:fig:trive_on_diagonal}
\end{figure}


\begin{figure}
  \includegraphics[scale=1]{"spectroscopy/wmels/trive_off_diagonal"}
  \caption[CAPTION TODO]{
    CAPTION TODO
  }
  \label{spc:fig:trive_off_diagonal}
\end{figure}

\begin{figure}
  \includegraphics[scale=1]{"spectroscopy/wmels/trive_population_transfer"}
  \caption[CAPTION TODO]{
    CAPTION TODO
  }
  \label{spc:fig:trive_population_transfer}
\end{figure}