Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nmgm.meet.1837r&link_type=abstract
"THE NINTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and R
Physics
1
Scientific paper
To reach the sensitivity goal of LIGO, the interferometer (IFO) requires extremely high-quality input laser light. The input optics (IO) subsystem of LIGO conditions the laser beam from a 10-Watt prestabilized laser to produce a pure TEM00 mode Gaussian beam with low frequency and intensity noise, high pointing stability, and proper mode matching into the IFO cavity. In addition, it adds phase modulation sidebands to the carrier frequency of the laser for IFO length and alignment sensing and control. The central element of the IO system is a suspended, long-baseline (12m) mode- cleaner. This triangular ring cavity serves as a reference for frequency stabilization, spatial mode selection, and intensity noise and beam jitter suppression. The other key components of the system are: electro-optic phase modulators, a suspended mode-matching telescope, and a Faraday isolator. The latter device both prevents light from back coupling into the laser and provides IFO sensing signals. This paper will give the characterization measurement results for the 2k interferometer at LIGO Hanford Observatory.
Adhikari Rameshwar
Delker Thomas
Fritschel Peter
Kells B.
Mavalvala Nergis
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