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LIGO-G0200XX-00-M LIGO Scientific Collaboration1 eLIGO Input Optics Characterization and Performance Kate Dooley University of Florida.

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Presentation on theme: "LIGO-G0200XX-00-M LIGO Scientific Collaboration1 eLIGO Input Optics Characterization and Performance Kate Dooley University of Florida."— Presentation transcript:

1 LIGO-G0200XX-00-M LIGO Scientific Collaboration1 eLIGO Input Optics Characterization and Performance Kate Dooley University of Florida

2 LIGO-G0200XX-00-M LIGO Scientific Collaboration2 Input Optics EOMs through MMT Laser Ref cavity Pre mode cleaner EOMs Mode cleaner Faraday isolator Recycling mirror Mode matching telescope

3 LIGO-G0200XX-00-M LIGO Scientific Collaboration3 IO Upgrade Why? 3x increase in laser power Commission advLIGO designs Fix problems found during iLIGO Tasks: New Faraday Isolator Clean mode cleaner Adjust mode matching telescope New electro-optic modulators

4 LIGO-G0200XX-00-M LIGO Scientific Collaboration4 New Layout MMT1 MMT3 SM MC3 MC1 PSL REFL to RM Faraday Isolator 0.65W ~7% loss For 1W into the vacuum…

5 LIGO-G0200XX-00-M LIGO Scientific Collaboration5 Mode Cleaner Absorption Absorption (ppm) Before Cleaning After Cleaning LHO20 78 41 19 25 51 LLO61 18 42 7 6.5 11

6 LIGO-G0200XX-00-M LIGO Scientific Collaboration6 Mode Cleaner Cavity Pole Before Cleaning After Cleaning LLO4569 Hz4500 Hz LHO4596 Hz4504 Hz Laser PD1PD2 MC swept-sine

7 LIGO-G0200XX-00-M LIGO Scientific Collaboration7 Faraday Isolator Higher isolation ratio »Multiple high extinction ratio polarizers »Multiple TGGs, Quartz rotator Higher transmission »High transmission polarizers »Low absorption TGG Lower thermal drift »Increased thermal contact with crystals Less thermal lensing »Negative lens DKDP

8 LIGO-G0200XX-00-M LIGO Scientific Collaboration8 Faraday Isolator Design DKDP QR HWP CWP TFP TGG TGG CWP Faraday rotator REFL p-pol => +22.5 - 67.5 + 22.5 + 22.5 => p-pol s-pol <= +22.5 + 67.5 + 22.5 - 22.5 <= p-pol

9 LIGO-G0200XX-00-M LIGO Scientific Collaboration9 Advanced Faraday Isolator

10 LIGO-G0200XX-00-M LIGO Scientific Collaboration10 Isolation Ratio iLIGOeLIGO In air26 dB35 dB In vacuum14 dB29 dB P in P out P refl p-pol s-pol Faraday Isolator LLO data

11 LIGO-G0200XX-00-M LIGO Scientific Collaboration11 Thermal Drift Upper limit of 3% beam diameter movement on WFS iLIGO~100 urad/W eLIGO~10 urad/W IN AIR LLO data

12 LIGO-G0200XX-00-M LIGO Scientific Collaboration12 Power Budget MMT1 MMT3 SM Faraday Isolator MC3 MC1 PSL For 1W into the vacuum… 0.9W REFL to PRM: 0.83W 0.74W

13 LIGO-G0200XX-00-M LIGO Scientific Collaboration13 Summary iLIGOeLIGO FI Isolation Ratio14 dB29 dB FI Transmission89%92% FI Thermal DriftBIGsmall FI Aperture12 mm20 mm FI Thermal Lens10 m-70 m Mode Cleaner Absorption (avg)43 ppm20 ppm Mode Cleaner Finesse13331360 IO Efficiency65%83%

14 LIGO-G0200XX-00-M LIGO Scientific Collaboration14 Acknowledgements Rupal Amin Muzammil Arain Betsy Bland Valera Frolov Dan Hoak Ketia Kawabe Mike Landry Antonio Lucianetti Rodica Martin Guido Mueller Volker Quetschke Dave Reitze Rick Savage Josh Smith David Tanner Luke Williams

15 LIGO-G0200XX-00-M LIGO Scientific Collaboration15 Extras

16 LIGO-G0200XX-00-M LIGO Scientific Collaboration16 Old Faraday Isolator

17 LIGO-G0200XX-00-M LIGO Scientific Collaboration17 Old Faraday Isolator

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