Download Characterization of LIGO Input Optics (Haisheng Rong

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts
no text concepts found
Transcript
Characterization of LIGO Input Optics
University of Florida
Caltech
MIT
Thomas Delker
Guido Mueller
Malik Rakhmanov
David Reitze
Haisheng Rong
Qi-ze Shu
David Tanner
Sanichio Yoshida
Jordan Camp
Bill Kells
Nergis Mavalvala
David Ottaway
Daniel Sigg
Stan Whitcomb
Rana Adhikari
Peter Fritschel
Mike Zucker
Presented by Haisheng Rong at
LSC Meeting 7
Hanford, 15-17 August 2000
Laser Interferometer Gravitational-wave Observatory
1
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
Laser Interferometer Gravitational-wave Observatory
2
Input Optics Components
IFO
Laser Interferometer Gravitational-wave Observatory
3
IO System Interfaces
Laser Interferometer Gravitational-wave Observatory
4
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
Laser Interferometer Gravitational-wave Observatory
5
Characterization Measurements

Mode Cleaner Length
» Measured with RF resonant side band detuning method.
» Uncertainty / Drift ~ 3ppm (50 mm)
» Position Accuracy < 1mm

MC Transmission
» 0.98  0.05

Mode Matching into the 2k Arm Cavity
» Power Coupling: 95%-98%
Laser Interferometer Gravitational-wave Observatory
6
Characterization Measurements

MC Output Beam Pointing Stability
» Long-term drift
~4mrad/hr
» Beam jitter
10 -10 rad/rtHz
at f >20Hz
Laser Interferometer Gravitational-wave Observatory
7
Characterization Measurements

MC cavity linewidth measurements
Ringdown
Transfer function
Laser Interferometer Gravitational-wave Observatory
8
Characterization Measurements

MC linewidth measurement results
Laser Interferometer Gravitational-wave Observatory
9
Characterization Measurements

Internal Q’s of MC mirrors
Laser Interferometer Gravitational-wave Observatory
10
MC - a sensitive analyzer cavity

Frequency noise of the PSL
Laser Interferometer Gravitational-wave Observatory
11
Effect of the vertical mirror motion

PSD of MC length control signal
F = 0.62 mrad
F=0
F: Angle of MC plane
wrt. horizontal
Laser Interferometer Gravitational-wave Observatory
12
Frequency noise of MC output

Frequency noise measured with 2k FP arm cavity
Laser Interferometer Gravitational-wave Observatory
13
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
Laser Interferometer Gravitational-wave Observatory
14
Related documents