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STATUS OF THE GEO HF SQUEEZED LIGHT SOURCE

STATUS OF THE GEO HF SQUEEZED LIGHT SOURCE. Alexander Khalaidovski , Henning Vahlbruch, Hartmut Grote, Harald Lück, Benno Willke, Karsten Danzmann and Roman Schnabel. AEI Hannover. LIGO-G0900232. LSC-Virgo March 2009 Meeting

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STATUS OF THE GEO HF SQUEEZED LIGHT SOURCE

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  1. STATUS OF THE GEO HF SQUEEZED LIGHT SOURCE Alexander Khalaidovski, Henning Vahlbruch, Hartmut Grote, Harald Lück, Benno Willke,Karsten Danzmann and Roman Schnabel AEI Hannover LIGO-G0900232 LSC-Virgo March 2009 Meeting Pasadena, March 18th 2009

  2. IN A NUTSHELL 1

  3. 2-COLOR LASER EXPERIMENTAL LAYOUT SCHEME I 2

  4. EXPERIMENTAL LAYOUT SCHEME I 3

  5. SECOND HARMONIC GENERATOR • Hemilithic cavity • Nonlinear medium: x x 11.510mm PPKTP crystal • Singly resonant at 1064 nm • Coupling mirror: R = 90%  Finesse ≈ 60 • Compact design •High intrinsic mechanical stability 4

  6. SHG/SQUEEZER DESIGN 5

  7. EFFICIENT SHG 6

  8. inferred conversion efficiency > 90% EFFICIENT SHG 7

  9. inferred conversion efficiency > 90% EFFICIENT SHG PRELIMINARY 8

  10. EXPERIMENTAL LAYOUT SCHEME II 9

  11. EXPERIMENTAL LAYOUT SCHEME III 10

  12. EXPERIMENTAL LAYOUT SCHEME IV 11

  13. EXPERIMENTAL LAYOUT SCHEME V 12

  14. GEO SQUEEZING BREADBOARD Main Laser: InnoLight Mephisto Aux. Lasers: Mephisto OEM Optics: ATF (superpolished) Nonlinear medium: PPKTP Breadboard: 113x135 cm Beam height: 50mm Compact design > 120 opt. components total weight ≈ 120 kg 13

  15. STATUS OF THE EXPERIMENT I 14

  16. STATUS OF THE EXPERIMENT II 15

  17. STATUS OF THE EXPERIMENT II 16

  18. STATUS OF THE EXPERIMENT II 17

  19. STATUS OF THE EXPERIMENT II 18

  20. ELECTRONIC CONTROL • Analog electronics for high bandwidth control loops • Digitally interfaced • Real time LINUX control system (EPICS) • Operation in 24 h/day, 7 days/week self-relocking mode 19

  21. TIMELINE AND SUMMARY TIMELINE GOAL • Assembling started! • Squeezing-improved sensitivity for GEO 600 • Squeezed light injection • Test of squeezing as standard tool into GEO 600: for future GW detectors Spring/Summer 2009 20

  22. THANK YOU

  23. SPARE SLIDES

  24. AUTO-ALIGNMENT SCHEME

  25. Total loss: 20% LOSS BUDGET 1% 1% 1% 1% 2% 2% 1% 5% 2% 5%

  26. LOSS BUDGET II Goal: 6 dB detected squeezing

  27. SHOT NOISE (DARK FRINGE OPERATION)

  28. Squeezed Light Input (8dB) QND-Regime BACK-ACTION NOISE [Unruh 1982] [Jaekel, Reynaud 1990] Shot noise Radiation pressure noise (SQL)

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