NDLI: Laser systems for gravitational wave detection

Content Provider	IEEE Xplore Digital Library
Author	Bondu, F.
Copyright Year	2005
Description	Author affiliation: UMR CNRS, Pisa, France (Bondu, F.)
Abstract	This paper reports on the status of the Virgo detector, now on its commissioning phase: we describe the setup, the implemented functions, we discuss the spectral resolution measured during the last commissioning data taking, we present some of the practical issues. We show the role of the optical metrology in the instrument. Its first role is on the apparatus design: we show how the optical design of Virgo improves the sensitivity compared to a simple Michelson interferometer. The laser beam needs to be very stable, in the detection band 10 Hz-10 kHz: beam pointing, power stability and frequency stability. We show that this can be achieved using very stable references and enhanced feedback loops. Optical metrology is also necessary to measure the mirror substrates and surfaces and ensure that they have the required properties: roughness, absorption, and local defects, transmission maps. The output of optical simulations using these maps can be compared with in-situ measurement of some global parameters: cavity finesses, mirror curvatures, contrast defect.
Starting Page	117
Ending Page	118
File Size	269613
Page Count	2
File Format	PDF
ISBN	0780389816
ISSN	10994742
DOI	10.1109/LEOSST.2005.1528021
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-07-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical interferometry Optical feedback Optical sensors Laser stability Metrology Optical design Laser beams Mirrors Phase detection Detectors
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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