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The variable finesse locking technique

Acernese, F. and Amico, P. and Al-Shourbagy, M. and Aoudia, S. and Avino, S. and Babusci, D. and Ballardin, G. and Barillé, R. and Barone, F. and Barsotti, L. and Barsuglia, M. and Beauville, F. and Bizouard, M. A. and Boccara, C. and Bondu, F. and Bosi, L. and Bradaschia, C. and Braccini, S. and Brillet, A. and Brisson, V. and Brocco, L. and Buskulic, D. and Calloni, E. and Campagna, E. and Cavalier, F. and Cavalieri, R. and Cella, G. and Chassande-Mottin, E. and Corda, C. and Clapson, A.-C. and Cleva, F. and Coulon, J.-P. and Cuoco, E. and Dattilo, V. and Davier, M. and De Rosa, R. and Di Fiore, L. and Di Virgilio, A. and Dujardin, B. and Eleuteri, A. and Enard, Q. and Ferrante, I. and Fidecaro, F. and Fiori, I. and Flaminio, R. and Fournier, J.-D. and Frasca, S . and Frasconi, F. and Freise, A. and Gammaitoni, L. and Gennai, A. and Giazotto, A. and Giordano, G. and Giordano, L. and Gouaty, R. and Grosjean, D. and Guidi, G. and Hebri, S. and Heitmann, H. and Hello, P. and Holloway, L. and Kreckelbergh, S. and La Penna, P. and Loriette, V. and Loupias, M. and Losurdo, G. and Mackowski, J.-M. and Majorana, E. and Man, C. N. and Mantovani, M. and Marchesoni, F. and Marion, F. and Marque, J. and Martelli, F. and Masserot, A. and Mazzoni, M. and Milano, L. and Moins, C. and Moreau, J. and Morgado, N. and Mours, B. and Pai, A. and Palomba, C. and Paoletti, F. and Pardi, S. and Pasqualetti, A. and Passaquieti, R. and Passuello, D. and Perniola, B. and Piergiovanni, F. and Pinard, L. and Poggiani, R. and Punturo, M. and Puppo, P. and Qipiani, K. and Rapagnani, P. and Reita, V. and Remillieux, A. and Ricci, F. and Ricciardi, I. and Ruggi, P. and Russo, G. and Solimeno, S. and Spallicci, A. and Stanga, R. and Taddei, R. and Tombolato, D. and Tonelli, M. and Toncelli, A. and Tournefier, E. and Travasso, F. and Vajente, G. and Verkindt, D. and Vetrano, F. and Viceré, A. and Vinet, J.-Y. and Vocca, H. and Yvert, M. and Zhang, Z. and Evans, M. (2006) The variable finesse locking technique. Classical and Quantum Gravity, 23 (8). S85-S89. ISSN 0264-9381.

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Virgo is a power recycled Michelson interferometer, with 3 km long Fabry-Perot cavities in the arms. The locking of the interferometer has been obtained with an original lock acquisition technique. The main idea is to lock the instrument away from its working point. Lock is obtained by misaligning the power recycling mirror and detuning the Michelson from the dark fringe. In this way, a good fraction of light escapes through the antisymmetric port and the power build-up inside the recycling cavity is extremely low. The benefit is that all the degrees of freedom are controlled when they are almost decoupled, and the linewidth of the recycling cavity is large. The interferometer is then adiabatically brought on to the dark fringe. This technique is referred to as variable finesse, since the recycling cavity is considered as a variable finesse Fabry-Perot. This technique has been widely tested and allows us to reach the dark fringe in few minutes, in an essentially deterministic way.

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Additional Information:© 2006 IOP Publishing Ltd. Received 29 August 2005. Published 24 March 2006. Print publication: Issue 8 (21 April 2006).
Issue or Number:8
Record Number:CaltechAUTHORS:ACEcqg06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12746
Deposited By: Ruth Sustaita
Deposited On:23 Dec 2008 21:22
Last Modified:03 Oct 2019 00:31

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