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Towards the Quantum Limit
An update from the AEI 10m Prototype
Tobin Fricke AEI Hannover for the 10m Prototype team
1. Purpose (+ Background)2. Status3. Outlook
Towards the Quantum Limit
An update from the AEI 10m Prototype
laser source
frequency
measured displacement
shot noise
radiation pressure noise
standard quantum limit
The mission(s) of the 10 m Prototype:• Observe quantum radiation pressure noise • Reach the standard quantum limit (m=100g, f=200Hz)• Provide a prototype test-bed facility with ultra-lowdisplacement noise, high vacuum, & flexible configuration
10
1
10
2
10
3
10
−24
10
−23
10
−22
Frequency [Hz]
Strain [1/
√
Hz]
Quantum noise
Seismic noise
Suspension thermal noise
Coating Brownian noise
Substrate Brownian noise
Total noise
L = 4 km, m = 40 kg
L = 10 m, m = 100 g
Installed and working!
Installed and working!
(two of three tables)
Installed and working!
not to scale
Installed and in commissioning
Designed, prototyped, tested, & now in fabrication.
• Three pendulum stages• Two vertical blade-spring stages• Lower stage all glass for lower thermal noiseBuilds on experience from GEO and aLIGO.
60 mm X 0.3 mm !
Large spot sizes are needed to reduce coating thermal noiseBut large spot sizes lead to geometric instability
C. Gräf, Class. Quantum Grav. 29 (2012) 075003
Rail-mounted
lenses for
waist tuning
Blocked by
Laser
Blocked by
Ref. Cavity
Blocked by
Ref. Cavity
Collimation
mirror
r~12m CC
CCD beam
spot monitor
QPD
FI
EOM
Platform for
steering optics
at viewport
RF/DC PD
WFS1+2
ETM
ITM
HWP
• Single, impedance-matched cavity• Tunable stability• Optics should arrive any day
1. Build a single marginally-stable cavity first to gain experience2. Start with a stable configuration and move towards instability3. Repeat with the full Michelson
2013
2014
Single Arm Test
Thermal Noise IFO
Build 3rd Table
install Michelson
to the SQL!
2012
Build & Install
Install Table 2
Design SUS
Fabricate
Build SPI
Install SPI
Make it work
Build & Install PMC
Make it work
Make it work
Order Core Optics
10m talksGerald Bergman - Seismic Isolation - this session!Sina Kohlenbeck - Suspension Platform Interferometer - this session!Manuela Hanke - Frequency stabilization - ThursdayTobias Westphal - Thermal Noise Interferometer - Friday10m lab tours!Tomorrow @13:45, 14:15, & 14:45 "DPG-Tagungsburo"