Embed Size (px)
Citation preview
Alexander Khalaidovski, Henning Vahlbruch, Hartmut Grote, Harald Lück, Benno Willke, Karsten Danzmann and Roman Schnabel
STATUS OF THE GEO HF
SQUEEZED LIGHT SOURCE
LSC-Virgo March 2009 Meeting
Pasadena, March 18th 2009
AEI Hannover
LIGO-G0900232
1
IN A NUTSHELL
EXPERIMENTAL LAYOUT SCHEME I
2
2-COLOR LASER
EXPERIMENTAL LAYOUT SCHEME I
3
SECOND HARMONIC GENERATOR
4
• Hemilithic cavity
• Nonlinear medium:
• Singly resonant at 1064 nm
• Coupling mirror: R = 90%
• Compact design
1 1.5 10 mm PPKTP crystal
Finesse ≈ 60
• High intrinsic mechanical
x x
stability
SHG/SQUEEZER DESIGN
5
EFFICIENT SHG
6
EFFICIENT SHG
7
inferred conversion efficiency
> 90%
EFFICIENT SHG
8
inferred conversion efficiency
> 90%
PRELIMINARY
EXPERIMENTAL LAYOUT SCHEME II
9
EXPERIMENTAL LAYOUT SCHEME III
10
EXPERIMENTAL LAYOUT SCHEME IV
11
EXPERIMENTAL LAYOUT SCHEME V
12
GEO SQUEEZING BREADBOARD
Breadboard: 113x135 cm
Main Laser: InnoLight Mephisto
> 120 opt. components
Aux. Lasers: Mephisto OEM
total weight ≈ 120 kg
13
Optics: ATF (superpolished)
Nonlinear medium: PPKTP
Beam height: 50mm
Compact design
STATUS OF THE EXPERIMENT I
14
STATUS OF THE EXPERIMENT II
15
STATUS OF THE EXPERIMENT II
16
STATUS OF THE EXPERIMENT II
17
STATUS OF THE EXPERIMENT II
18
ELECTRONIC CONTROL
• Analog electronics for high
• Digitally interfaced
• Real time LINUX
• Operation in
bandwidth control loops
control system (EPICS)
24 h/day, 7 days/week self-relocking mode
19
TIMELINE AND SUMMARY
• Assembling started!
• Squeezed light injection
TIMELINE
Spring/Summer 2009
into GEO 600:
GOAL
• Squeezing-improvedsensitivity for GEO 600
• Test of squeezing as standard toolfor future GW detectors
20
THANK YOU
SPARE SLIDES
AUTO-ALIGNMENT SCHEME
LOSS BUDGET
5% 2% 5%
1%
1%1%
1%
1%
2% 2%
Total loss: 20%
LOSS BUDGET II
Goal:
6 dB detected squeezing
SHOT NOISE (DARK FRINGE OPERATION)
BACK-ACTION NOISE
(SQL)
Shot noise
Radiation pressure
noise
[Unruh 1982][Jaekel, Reynaud 1990]
QND-Regime
Squeezed Light Input (8dB)
ˆ X 1
ˆ X 2
