Alexander Khalaidovski, Henning Vahlbruch, Hartmut Grote, Harald Lück, Benno Willke, Karsten...
-
Upload
bridget-bryant -
Category
Documents
-
view
216 -
download
0
Transcript of Alexander Khalaidovski, Henning Vahlbruch, Hartmut Grote, Harald Lück, Benno Willke, Karsten...
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