Commit 4bd19753 authored by Andreas Freise's avatar Andreas Freise
Browse files

updating sagnac example to latest files

parent 903088e1
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......@@ -43,6 +43,7 @@ def main():
extra = kat._kat__blocks['NO_BLOCK']
# adding homodyne detector
#kat.addLine('qhdS sens 180 nout1 nout2')
extra.contents.append('qhdS sens 180 nout1 nout2')
extra.contents.append('scale meter sens')
......@@ -51,10 +52,18 @@ def main():
result=OrderedDict()
legend = {}
# getting mass of the light mirror of cavity a
# getting mass of the light mirror of cavity a
global m
m = kat.M1a.mass.value
# getting the anle of incidence on end mirrors:
AoI2 = float(kat.constants['AoI2'].value) / 180.*np.pi
# fsig applied to a BS with AoI!=0 reduces the phase
# change for a given signal in meters. Thus to make the
# finesse results comaptible with the default SQL we need
# to scale the results with cos(AoI):
global AoIScale
AoIScale=np.cos(AoI2)
# setting frequency range
global f
f = namedtuple('f', ('start','stop','points','data'))
f.start=100
......@@ -62,44 +71,65 @@ def main():
f.points = 100
kat.parseKatCode('xaxis sig1 f log {0} {1} {2}'.format(f.start, f.stop, f.points-1))
# Reading Haixing Miao's reference data:
datah1=np.loadtxt('QN_Sagnac_25ppm_loss.dat')
datah2=np.loadtxt('QN_Sagnac_lossless.dat')
print "--------------------------------------------------------"
print " 0. Run default file"
print " Run default file (no loss)"
out = kat.run()
#f.data = np.logspace(np.log10(f.start), np.log10(f.stop), f.points)
f.data=out.x # getting frequency vector from Finesse instead
print "--------------------------------------------------------"
print " 1. Computing SQL"
print " Computing SQL"
hbar=6.62606957E-34/(2.0 *np.pi)
SQL_x= np.sqrt( 4 * hbar / ( m * f.data**2 * 4 * np.pi * np.pi ))
legend['SQL']=mylegend('SQL','k')
result['SQL']=SQL_x
result['default']=out.y
legend['default']=mylegend('Stefan D. example file','b')
result['default']=out.y*AoIScale
legend['default']=mylegend('Finesse, no loss','m')
print "--------------------------------------------------------"
print " 2. Open ETM ports, i.e. replacing dump nodes"
kat.M2a.remove()
kat.M3a.remove()
kat.parseCommands('bs1 M2a $T_ETM 0 0 0 nM2aw nM2an nM2aT1 nM2aT2')
kat.parseCommands('bs1 M3a $T_ETM 0 0 0 nM3aw nM3an nM3aT1 nM3aT2')
kat.M2b.remove()
kat.M3b.remove()
kat.parseCommands('bs1 M2b $T_ETM 0 0 0 nM2bw nM2bn nM2bT1 nM2bT2')
kat.parseCommands('bs1 M3b $T_ETM 0 0 0 nM3bw nM3bn nM3bT1 nM3bT2')
out=kat.run()
result['open']=out.y
legend['open']=mylegend('Opening M2/M3 ports','r')
result['H1']=datah1[:,1]
legend['H1']=mylegend('Haixing, no loss','k')
legend['H1'].lt='--.'
print "--------------------------------------------------------"
print " 3. Imbalanced BS"
result['bs']=imbalanced_bs(kat)
legend['bs']=mylegend('Imbalanced BS 49:51','g')
print " Run file with loss (or transmission) on end mirrors"
L=12.5e-6
#L=0
#T=25e-6
T=0
R=1-T-L
kat.M2a.R=R
kat.M3a.R=R
kat.M2b.R=R
kat.M3b.R=R
kat.M2a.T=T
kat.M3a.T=T
kat.M2b.T=T
kat.M3b.T=T
kat.M2a.L=L
kat.M3a.L=L
kat.M2b.L=L
kat.M3b.L=L
out=kat.run()
result['loss']=out.y*AoIScale
legend['loss']=mylegend('Finesse, 25ppm loss','b')
result['H2']=datah2[:,1]
legend['H2']=mylegend('Haixing, 25ppm loss','k')
legend['H2'].lt='-.'
print "--------------------------------------------------------"
print " 3. Mass asymmetry"
result['mass']=mass(kat)
legend['mass']=mylegend('Mass asymmetry 10%','c')
print " Additional imbalanced BS"
result['bs']=imbalanced_bs(kat)*AoIScale
legend['bs']=mylegend('Imbalanced BS 49:51','r')
#print "--------------------------------------------------------"
#print " Mass asymmetry"
#result['mass']=mass(kat)*AoIScale
#legend['mass']=mylegend('Mass asymmetry 10%','c')
print "--------------------------------------------------------"
print " Plotting results"
......@@ -129,20 +159,30 @@ def imbalanced_bs(tmpkat):
kat.M6.T=0.51
out=kat.run()
return out.y
def update_plot(f, result):
for i, T in enumerate(result.keys()):
data=result[str(T)]
for j,f1 in enumerate(f):
lines[i].set_ydata(data(j))
fig.canvas.draw()
def plot_results(f, result, legend):
fig=pl.figure()
fig=pl.figure(232)
fig.clear()
N=len(result)
lines={}
for i, T in enumerate(result.keys()):
data=result[str(T)]
pl.plot(f.data, data,legend[str(T)].lt, color=legend[str(T)].color, label=legend[str(T)].text, lw=legend[str(T)].lw)
lines[i],=pl.plot(f.data, data,legend[str(T)].lt, color=legend[str(T)].color, label=legend[str(T)].text, lw=legend[str(T)].lw)
#line.set_dashes([12, 4])
ax=pl.gca()
ax.set_yscale('log')
ax.set_xscale('log')
pl.xlabel("f [Hz}")
pl.ylabel("Sensitivity [m/sqrt(hz)]")
pl.xlabel("f [Hz]")
pl.ylabel("Sensitivity [m/sqrt(Hz)]")
pl.xlim([f.start,f.stop])
pl.ylim([1E-20, 2E-17])
pl.grid()
......
......@@ -6,17 +6,20 @@
# Andreas Freise, 30.10.2014
#
# The parameters below don't necessarily match the current
# speedmeter design, instead they were chosen to match Stefan
# Danilishin's Matlab example for comparison. However, you can
# easily change the parameters to an updated design without
# problem. No special tuning or so is required.
# speedmeter design, instead they were chosen to fit an example
# file from Stefan Danilishin. However, you can easily change
# the parameters to an updated design without problem.
#################################################################
## general constants
const Pin 0.6 # double the power at the BS, which for this example is 0.3W
const MassM1 1m # Mass M1 in [kg]: 1 gramm
const MassM23 100m # Mass M2, M3: 100 gramm
const T_ETM 12.5u # transmission of cavity end mirrors (cavity loss)
const MassM23 100 # Mass M2, M3: 100 gramm
const T_ETM 0u # transmission of cavity end mirrors (cavity loss)
const L_ETM 0u # loss of cavity end mirrors (cavity loss)
const AoI 0 # angle of incidence on input mirror (4.4 deg)
const AoI2 0 # angle of incidence on end mirror (42.8 deg)
## lengths of some ray segments
const lrs2 0.250
......@@ -50,21 +53,14 @@ s rs7 $lrs7 nM6e nM7w
bs M7 1 0 0 49.39870535E0 nM7w nM7n dump dump
s rs8 $lrs8 nM7n nM1an
bs1 M1a 500u 0 0 0 nM1aw nM1an nM1ae nM1as
bs1 M1a 500u 0 0 $AoI nM1aw nM1an nM1ae nM1as
attr M1a Rc -7.91
attr M1a mass $MassM1
s rs12 1.315 nM3an nM1ae
##################################################################
# Note that the following lines are 'wrong'. The 'dump' notes
# are not open ports, i.e. even with the transmssion of the ETMs
# non-zero, no quantum noise will enter through this port.
# I am using dump notes here to match Stefan's example calculation,
# but you should not use 'dump' nodes with any mirror or BS that
# has non-zero losses or transmission
bs1 M3a $T_ETM 0 0 0 nM3aw nM3an dump dump #nM3aT1 nM3aT2
bs1 M3a $T_ETM $L_ETM 0 $AoI2 nM3aw nM3an nM3aT1 nM3aT2
attr M3a mass $MassM23
s rs11 0.2 1. nM2an nM3aw
bs1 M2a $T_ETM 0 0 0 nM2aw nM2an dump dump #nM2aT1 nM2aT2
bs1 M2a $T_ETM $L_ETM 0 $AoI2 nM2aw nM2an nM2aT1 nM2aT2
attr M2a mass $MassM23
s rs10 1.315 nM1as nM2aw
cav AC_a M1a nM1as M1a nM1ae
......@@ -83,21 +79,14 @@ s rs26 $lrs26 nM8n nM1bw
#################################################################
## Cavity b
bs1 M1b 500u 0 0 0 nM1bw nM1bn nM1be nM1bs
bs1 M1b 500u 0 0 $AoI nM1bw nM1bn nM1be nM1bs
attr M1b Rc -7.91
attr M1b mass $MassM1
s rs19 1.315 nM1be nM2bw
##################################################################
# Note that the following lines are 'wrong'. The 'dump' notes
# are not open ports, i.e. even with the transmssion of the ETMs
# non-zero, no quantum noise will enter through this port.
# I am using dump notes here to match Stefan's example calculation,
# but you should not use 'dump' nodes with any mirror or BS that
# has non-zero losses or transmission
bs1 M2b $T_ETM 0 0 0 nM2bw nM2bn dump dump #nM2bT1 nM2bT2
bs1 M2b $T_ETM $L_ETM 0 $AoI2 nM2bw nM2bn nM2bT1 nM2bT2
attr M2b mass $MassM23
s rs20 0.2 nM2bn nM3bw
bs1 M3b $T_ETM 0 0 0 nM3bw nM3bn dump dump #nM3bT1 nM3bT2
bs1 M3b $T_ETM $L_ETM 0 $AoI2 nM3bw nM3bn nM3bT1 nM3bT2
attr M3b mass $MassM23
s rs21 1.315 nM3bn nM1bs
cav AC_b M1b nM1bs M1b nM1be
......@@ -124,7 +113,7 @@ bs dHD .5 .5 0 0 nHD1 nout1 nout2 nl3
# homodyne detector, use 180 deg phase for normal use, i.e. output=nout1-nout2
#qhdS sens 180 nout1 nout2
# scale output to m/sqrt(Hz)
# re-scaling output to m/sqrt(Hz)
#scale meter sens
%xaxis sig1 f log 100 100k 99
......
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