Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprb17054u&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The Caltech LIGO 40-meter gravitational wave interferometer prototype is being rebuilt to investigate resonant sideband extraction (RSE), a new optical technique to improve sensitivity to gravitational waves at high frequencies. In this technique a signal recycling mirror is added to the asymmetric port of the interferometer, and the compound cavity formed by this mirror and the interferometer arms is tuned to resonate at the signal sidebands, the beats between the carrier frequency and the gravitational-wave signal. The 40-meter will be an engineering prototype for RSE, testing the electronics and controls scheme before delivery to the main LIGO sites, as well as a shot-noise-limited testbed to reveal the effects or RSE on the high-frequency sensitivity curve. The recommissioning of the interferometer is on schedule for completion in early 2003, with significant progress in several systems: seismic isolation, vacuum controls, environmental monitoring, data acquisition, pre-stabilized laser commissioning, and suspended optic and control scheme design.
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