The variable finesse locking technique
Year: 2006
Authors: Acernese F., Amico P., Al-Shourbagy M., Aoudia S., Avino S., Babusci D., Ballardin G., Barille R., Barone F., Barsotti L., Barsuglia M., Beauville F., Bizouard MA., Boccara C., Bondu F., Bosi L., Bradaschia C., Braccini S., Brillet A., Brisson V., Brocco L., Buskulic D., Calloni E., Campagna E., Cavalier F., Cavalieri R., Cella G., Chassande-Mottin E., Corda C., Clapson AC., Cleva F., Coulon JP., Cuoco E., Dattilo V., Davier M., De Rosa R., Di Fiore L., Di Virgilio A., Dujardin B., Eleuteri A., Enard D., Ferrante I., Fidecaro F., Fiori I., Flaminio R., Fournier JD., Frasca S., Frasconi F., Freise A., Gammaitoni L., Gennai A., Giazotto A., Giordano G., Giordano L., Gouaty R., Grosjean D., Guidi G., Hebri S., Heitmann H., Hello P., Holloway L., La Penna P., Loriette V., Loupias M., Losurdo G., Mackowski JM., Majorana E., Man CN., Mantovani M., Marchesoni F., Marion F., Marque J., Martelli F., Masserot A., Mazzoni M., Milano L., Moins C., Moreau J., Morgado N., Mours B., Pai A., Palomba C., Paoletti F., Pardi S., Pasqualetti A., Passaquieti R., Passuello D., Perniola B., Piergiovanni F., Pinard L., Poggiani R., Punturo M., Puppo P., Qipiani K., Rapagnani P., Reita V., Remillieux A., Ricci F., Ricciardi I., Ruggi P., Russo G., Solimeno S., Spallicci A., Stanga R., Taddei R., Tombolato D., Tonelli M., Toncelli A., Tournefier E., Travasso F., Vajente G., Verkindt D., Vetrano F., Vicere A., Vinet JY., Vocca H., Yvert M., Zhang Z., Evans M.
Autors Affiliation: 1 INFN, Sezione di Napoli and/or Universit� di Napoli �Federico II� Complesso Universitario di Monte S. Angelo, and/or Universit� di Salerno, Fisciano (Sa), Italy
2 INFN, Sezione di Perugia and/or Universit� di Perugia, Perugia, Italy
3 INFN, Sezione di Pisa and/or Universit� di Pisa, Pisa, Italy
4 Departement Artemis�Observatoire de la C�ote d�Azur, BP 42209 06304 Nice, Cedex 4, France
5 INFN, Laboratori Nazionali di Frascati, Frascati (Rm), Italy
6 European Gravitational Observatory (EGO), Cascina (Pi), Italy
7 Laboratoire de l�Acc�l�rateur Lin�aire (LAL), IN2P3/CNRS-Univ. de Paris-Sud, Orsay, France
8 Laboratoire d�Annecy-le-Vieux de Physique des Particules, Annecy-le-Vieux, France
9 ESPCI, Paris, France
10 INFN, Sezione di Roma and/or Universit� �La Sapienza�, Roma, Italy
11 INFN, Sezione di Firenze/Urbino, Sesto Fiorentino, and/or Universit� di Firenze, and/or Universit� di Urbino, Italy
12 LMA, Villeurbanne, Lyon, France
13 LIGO Laboratory, California Institute of Technology, Pasadena, CA, USA
Abstract: 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.
Journal/Review: CLASSICAL AND QUANTUM GRAVITY
Volume: 23 (8) Pages from: S85 to: S89
KeyWords: Michelson interferometer; frequency locking; cavity finesse
DOI: 10.1088/0264-9381/23/8/S12
Citations: 23
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