Commit 7c11f3e7 authored by Daniel Brown's avatar Daniel Brown
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adding new tests for pdh frequency noise transfer function and cancellation of...

adding new tests for pdh frequency noise transfer function and cancellation of first with second order sidebands using manual user frequencies
parent 5abf4ae0
#----------------------------------------------------------------------------
# the `bad example' from Keita's document 'sidebands'
#----------------------------------------------------------------------------
# laser P=1W, f.offset=0Hz
l i1 1 0 ni
s s0 0 ni n0
# PDH modulation
mod EO 10M 0.01 1 pm n0 n1_1
s s1 0 n1_1 n1_2
# Definition of nearly all-reflective cavity.
m m1 0.99 0.01 0 n1_2 n2 # mirror R=0.99 T=0.01, phi=0
s s1 2.99792458 n2 n3 # space L=c*10ns
m m2 0.9999 0.00001 0 n3 dump # mirror R=0.9999 T=0.00001 phi=0
# i.e. the finesse is 600 or something, FSR=50M,
# and the half BW is about 40k
# FM for laser
fsig sig1 i1 10 0
# photo diode + 2 mixers for the field
# first demodulation at the exact frequency of E0, phase=0
# second is used for network analyzer.
pd2 reflected 10M 0 10 n1_2 # coming from m1:
xaxis sig1 f log 10 1M 40 # Change the FM frequency from 10 to 1M
put reflected f2 $x1
yaxis db:deg # plot gain in dB and phase
gnuterm no
# add 10M sidebands around the 60M EOM
mf -70M -50M 50M 70M
l i1 1 0 n0
s s0 0 n0 n1
mod E0 10M 0.01 1 pm 0 n1 n2
s s1 0 n2 n3
mod E1 60M 0.01 1 pm 0 n3 n4
pd1 pd 70M 0 n4
xaxis E0 phase lin 0 180 100
yaxis abs
gnuterm no
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