%% 
%%  A DANTE-Edition example
%% 
%%  Example 33-03-26 on page 699.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\setlength\parindent{0pt}

\usepackage{pst-optexp, nicefrac}

\begin{document}
\begin{pspicture}(-4,-1)(3,3)
\addtopsstyle{Beam}{linewidth=2\pslinewidth,linecolor=red!90!black}
\psset{labeloffset=0.5}
\pnode(-2,0){LaserOut}\pnode(0,0){Grat}\pnode(4;45){Out}\pnode(2.5;67.5){Mvar}
\optbox[optboxwidth=2,labeloffset=0,endbox](Grat)(LaserOut){diode laser}
\mirror[variable,conn=o-](Grid)(Mvar)(Grid){M$_\mathrm{var}$}
\optgrid[beam](LaserOut)(Grat)(Out){grating}
\optretplate[position=0.3,labeloffset=0.8](LaserOut)(Grat){$\nicefrac{\lambda}{4}$}
\rput[l](-3,2){Littman setup}
\end{pspicture}
\end{document}