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