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Laser Interferometer Gravitational-wave Observatory1 Characterization of LIGO Input Optics University of Florida Thomas Delker Guido Mueller Malik Rakhmanov.

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Presentation on theme: "Laser Interferometer Gravitational-wave Observatory1 Characterization of LIGO Input Optics University of Florida Thomas Delker Guido Mueller Malik Rakhmanov."— Presentation transcript:

1 Laser Interferometer Gravitational-wave Observatory1 Characterization of LIGO Input Optics University of Florida Thomas Delker Guido Mueller Malik Rakhmanov David Reitze Haisheng Rong Qi-ze Shu David Tanner Sanichio Yoshida MIT Rana Adhikari Peter Fritschel Mike Zucker Caltech Jordan Camp Bill Kells Nergis Mavalvala David Ottaway Daniel Sigg Stan Whitcomb Presented by Haisheng Rong at LSC Meeting 7 Hanford, 15-17 August 2000

2 Laser Interferometer Gravitational-wave Observatory2 Input Optics System Primary Functions of the IO System  Conditioning of the PSL output  Frequency, Intensity and beam pointing stability  Filter high-order modes  Mode matching and beam delivery  Optical isolation  RF sidebands generation for IFO sensing

3 Laser Interferometer Gravitational-wave Observatory3 Input Optics Components IFO

4 Laser Interferometer Gravitational-wave Observatory4 IO System Interfaces

5 Laser Interferometer Gravitational-wave Observatory5 Status of the IO System LHO 2k »Operational since 08/99 »Major characterization measurements finished »Integration with 2k IFO arm cavity successful »Modification and realignment 04/00 – 05/00 LLO 4k »Mode cleaner locked in 03/00 »Characterization and improvement 03/00 – 06/00 »IO realignment 06/00 – 08/00 LHO 4k »Installation started 07/00

6 Laser Interferometer Gravitational-wave Observatory6 Characterization Measurements Mode Cleaner Length »Measured with RF resonant side band detuning method. »Uncertainty / Drift ~ 3ppm (50  m ) »Position Accuracy < 1mm MC Transmission »0.98  0.05 Mode Matching into the 2k Arm Cavity »Power Coupling: 95%-98%

7 Laser Interferometer Gravitational-wave Observatory7 Characterization Measurements MC Output Beam Pointing Stability »Long-term drift ~4  rad/hr »Beam jitter 10 -10 rad/rtHz at f >20Hz

8 Laser Interferometer Gravitational-wave Observatory8 Characterization Measurements MC cavity linewidth measurements RingdownTransfer function

9 Laser Interferometer Gravitational-wave Observatory9 Characterization Measurements MC linewidth measurement results

10 Laser Interferometer Gravitational-wave Observatory10 Characterization Measurements Internal Q’s of MC mirrors

11 Laser Interferometer Gravitational-wave Observatory11 MC - a sensitive analyzer cavity Frequency noise of the PSL

12 Laser Interferometer Gravitational-wave Observatory12 Effect of the vertical mirror motion PSD of MC length control signal  = 0.62 mrad  = 0  :Angle of MC plane wrt. horizontal

13 Laser Interferometer Gravitational-wave Observatory13 Frequency noise of MC output Frequency noise measured with 2k FP arm cavity

14 Laser Interferometer Gravitational-wave Observatory14 Coming up Lock MC at designed input power »Scattered laser light interacts with suspension local sensors, causing angular instability »Solution –Phase sensitive detection (coherent sensor) –New shadow sensors

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