Alexander Khalaidovski, Henning Vahlbruch, Hartmut Grote, Harald Lück, Benno Willke, Karsten Danzmann and Roman Schnabel STATUS OF THE GEO HF SQUEEZED.

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Presentation transcript:

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-G

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 mm PPKTP crystal  Finesse ≈ 60 High intrinsic mechanical x x stability

SHG/SQUEEZER DESIGN 5

EFFICIENT SHG 6

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-improved sensitivity for GEO 600 Test of squeezing as standard tool for future GW detectors 20

THANK YOU

SPARE SLIDES

AUTO-ALIGNMENT SCHEME

LOSS BUDGET 5%2%5% 1% 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)