Scientific Results

An optical trasduction chain for the AURIGA detector

Year: 2000

Authors: Conti L., Marin F., De Rosa M., Prodi G. A., Taffarello L., Zendri J. P., Cerdonio M., Vitale S.

Autors Affiliation: Dipartimento di Fisica, Università di Trento, and INFN Gruppo Coll. Trento, I-38050 Povo (Trento), Italy;
Dipartimento di Fisica, Università di Firenze, and INFN Sez. Firenze, L.go E.Fermi 2, I-50125 Arcetri (Firenze), Italy;
European Laboratory for Nonlinear Spectroscopy (LENS), L.go E.Fermi 2, I-50125 Arcetri (Firenze), Italy;
INFN Sez. Padova, Via F.Marzolo 8, I-35100 Padova, Italy;
Dipartimento di Fisica, Università di Padova, and INFN Sez. Padova,Via F. Marzolo 8, I-35100 Padova, Italy.

Abstract: We describe the principle of operation of an opto-mechanical readout for resonant mass gravitational wave detectors; with such a device the AURIGA detector is expected to reach a sensitivity at the level of √Shh = 10-22/√Hz over a bandwidth of about 40Hz. Recent developments in the implementation of this transduction chain
are also reported. In particular we acheive quantum limited laser power noise in the frequency range of 200Hz around the bar fundamental frequency (about 1kHz) by means of active stabilization. We also set up a reference cavity of finesse 40000 with optically contacted mirrors on a 0.2m long Zerodur spacer. The cavity can be heated from room temperature to about 100°C and temperature stabilized with uctuations within 1mK over a period of several days. The cavity is under vacuum and isolated from mechanical disturbancies by means of a double stage cantilever system.

Conference title: Gravitational waves: Third Edoardo Amaldi Conference
Place: Pasadena (USA)

KeyWords: gravitational waves

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