Status of the Advanced LIGO PSL development LSC Virgo meeting, Caltech, March 2008
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Status of the Advanced LIGO PSL development
LSC Virgo meeting, Caltech, March 2008
LIGO G080143-00-Z
Benno Willke
for the PSL team
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Advanced LIGO prestabilized laser
mediumpowerstage
highpowerstage
NPRO
referencecavity
AOM
pre-modecleaner
to interferometer
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Innolight Mephisto
all 8 Master lasers (2W NPROs) are delivered
they have a special interface and specially selected LDs
characterization program power, slope, power in p-pol RIN:
noise spectrum 1Hz – 100kHz, time series (60min) rms
frequency noise spectrum 1Hz – 100kHz upper limit for drift
PZT and slow actuator calibration beam quality
higher order mode content beam pointing
LDs power is de-rated by 30% to increase their lifetime and give headroom for power adjust
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Advanced LIGO prestabilized laser
mediumpowerstage
highpowerstage
NPRO
referencecavity
AOM
pre-modecleaner
to interferometer
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PMC design
first prototype fabricated at AEI Finesse 46 / 383 since Jan 2008 operated in
s-pol with 35W injected (60% higher circulating power than in AdvLIGO)
PZT FSR ↔ 140V first resonance @ 10kHz
aluminium spacer to allow for long range thermal actuator
in sealed housing, probably no vacuum required
rf filtering 4dB @9MHz, sufficient to meet
AdvLIGO requirements
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frequency stabilization
shutter
mediumpowerstage
highpowerstage
NPRO
referencecavity
AOM
spatialfilter
cavity
shutter
variableattenuatorwith powermeter
AOM
EOM FI FI
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102
103
104
10-2
10-1
100
Frequency (Hz)
Fre
qu
ency
No
ise
(Hz/
Hz1
/2)
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diagnostic bread board
shutter
mediumpowerstage
highpowerstage
NPRO
referencecavity
AOMPSL internalDiagnostic
spatialfilter
cavity
shutter
variableattenuatorwith powermeter
powermeter
shutter
AOM
EOM FI FI
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beam diagnostic tool
Kwee et al, Rev. Sci. Instrum. 78, 073103 (2007)
diagnostic tool to measure power noise (low f and rf) frequency noise higher order mode content beam pointing (differential
wavefront sensing) fully automated
automatic length and alignment control
can switch from lock to scan mode performs complete beam analysis
without human interaction (at night during long term test)
allows fast turn around between laser optimization and characterization
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NPRO (filtered by a fiber and PMC)
Finesse: 366 ±5higher order mode power: 0.56% ±0.3%
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Advanced LIGO prestabilized laser
mediumpowerstage
highpowerstage
NPRO
referencecavity
AOM
pre-modecleaner
to interferometer
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PSL / IO Table layout
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real estate on the PSL table is currently negotiated between IO and PSL
layout sketch above will change
PSL table more crowded than in inital LIGO
table size probably just big enough
can DBB be used for IO diagnostic purposes ?
cleanliness, easy access, small number of componets in 180W laser path
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Advanced LIGO PSL setup
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PSL control
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laser diode room location
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laser diode room
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PSL control
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DBB control with RTLinux/Epics system
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RTLinux/Epics system was installed at AEI
length and alignment control of ring cavity in DBB via digital control
now used to control FSS
next step: automate lock acqisition for ref. cavity and include PMC
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next steps
finalize functional prototype of 180W laser and move to engineering prototype
measure free running noise and actuator transferfunctions to design Pstab loop
continue long term performance measurements and integration test at AEI LIGO provides additional DAC/ADC hardware implement PMC and ISS loop install automation and measure cross couplings between
loops find phase delay in FSS and test different sensing points
PSL preliminary design review in summer
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