removing length tuning, as the example makes no real sense

examples/length_tuning.py

-# -*- coding: utf-8 -*-
-"""
-Created on Tue Dec 10 14:18:17 2013
-
-@author: Sean
-"""
-
-import sys
-sys.path.append("../")
-
-import pykat
-from pykat.optics.gaussian_beams import gauss_param
-import pykat.finesse as finesse
-from pykat.commands import xaxis
-import pylab as pl
-import numpy as np
-import math
-
-code = """
-%------------------------------------------------------------------------
-% Finesse input file to plot the phase of light field reflected from a
-% beam splitter to show the way lengths and positions are handled
-% Andreas Freise 15.08.2009
-%------------------------------------------------------------------------
-                 
-l l1 1 0 n1    % laser with P=1W at the default frequency
-s s1 1 1 n1 n2 % space of 1m length
-bs b1 1 0 0 0 n2 n3 dump dump % beam splitter as `turning mirror'
-s s2 1 1 n3 n4 % another space of 1m length
-ad ad1 0 n4     % amplitude detector
- 
-% for the plot we perform two sequenctial runs of Finesse
-% 1) first trace: change microscopic position of beamsplitter
-xaxis b1 phi lin 0 180 100
-% 2) second trace: change length of space s1
-% xaxis s1 L lin 1 2 100
- 
-yaxis deg     % plotting the phase of the results
-"""
-
-kat = finesse.kat()
-kat.parseCommands(code)
-
-maxtem = np.arange(0, 2, 2)
-
-kat.trace = 17
-
-for tem in maxtem:
-    print "Calculating maxtem ", tem, "..."
-    kat.maxtem = tem
-    r = kat.run()
-    pl.plot(r.x, r.y, label="maxtem={0}".format(tem))
-
-pl.ylabel("Phase [deg]")
-pl.xlabel("Tuning [deg]")
-pl.legend()
-pl.show()
-