We describe a model evaluating changes in the optical isolation of a Faraday isolator when passing from air to vacuum in terms of different thermal effects in the crystal. The changes are particularly significant g a in the crystal thermal lensing (refraction index and thermal expansion) and in its Verdet constant and can be, ascribed to the less efficient convection cooling of the magneto-optic crystal of the Faraday isolator. An isolation decrease by a factor of 10 is experimentally observed in a Faraday isolator that is used in a gravitational wave experiment (Virgo) with a 10 W input laser when going from air to vacuum. A finite element model simulation reproduces with a great accuracy the experimental data measured on Virgo and on a test bench. A first set of measurements of the thermal lensing has been used to characterize the losses of the crystal, which depend on the sample. The isolation factor measured on Virgo confirms the simulation model and the absorption losses of 0.0016 +/- 0.0002/cm for the TGG magneto-optic crystal used in the Faraday isolator. (C) 2008 Optical Society of America

Acernese, F., Alshourbagy, M., Amico, P., Antonucci, F., Aoudia, S., Astone, P., et al. (2008). In-vacuum optical isolation changes by heating in a Faraday isolator. In APPLIED OPTICS (pp.5853-5861). WASHINGTON : OPTICAL SOC AMER.

In-vacuum optical isolation changes by heating in a Faraday isolator

COCCIA, EUGENIO;FAFONE, VIVIANA;Lorenzini, M;
2008-01-01

Abstract

We describe a model evaluating changes in the optical isolation of a Faraday isolator when passing from air to vacuum in terms of different thermal effects in the crystal. The changes are particularly significant g a in the crystal thermal lensing (refraction index and thermal expansion) and in its Verdet constant and can be, ascribed to the less efficient convection cooling of the magneto-optic crystal of the Faraday isolator. An isolation decrease by a factor of 10 is experimentally observed in a Faraday isolator that is used in a gravitational wave experiment (Virgo) with a 10 W input laser when going from air to vacuum. A finite element model simulation reproduces with a great accuracy the experimental data measured on Virgo and on a test bench. A first set of measurements of the thermal lensing has been used to characterize the losses of the crystal, which depend on the sample. The isolation factor measured on Virgo confirms the simulation model and the absorption losses of 0.0016 +/- 0.0002/cm for the TGG magneto-optic crystal used in the Faraday isolator. (C) 2008 Optical Society of America
1st North American Symposium, on Laser Induced Breakdown Spectroscopy
New Orleans, LA
OCT 08-10, 2007
Mississippi State Univ
Rilevanza internazionale
2008
Settore FIS/01 - FISICA SPERIMENTALE
English
SELF-INDUCED DEPOLARIZATION; ADAPTIVE COMPENSATION; LASER-RADIATION; DISTORTIONS
Intervento a convegno
Acernese, F., Alshourbagy, M., Amico, P., Antonucci, F., Aoudia, S., Astone, P., et al. (2008). In-vacuum optical isolation changes by heating in a Faraday isolator. In APPLIED OPTICS (pp.5853-5861). WASHINGTON : OPTICAL SOC AMER.
Acernese, F; Alshourbagy, M; Amico, P; Antonucci, F; Aoudia, S; Astone, P; Avino, S; Ballardin, G; Baggio, L; Barone, F; Barsotti, L; Barsuglia, M; Bauer, T; Bigotta, S; Birindelli, S; Bizouard, M; Boccara, A; Bondu, F; Bosi, L; Braccini, S; Bradaschia, C; Brillet, A; Brisson, V; Buskulic, D; Cagnoli, G; Calloni, E; Campagna, E; Carbognani, F; Carbone, L; Cavalier, F; Cavalieri, R; Cella, G; Cesarini, E; Chassande Mottin, E; Chatterji, S; Cleva, F; Coccia, E; Corda, C; Corsi, A; Cottone, F; Coulon, J; Cuoco, E; D'Antonio, S; Dari, A; Dattilo, V; Davier, M; De Rosa, R; Del Prete, M; Di Fiore, L; Di Lieto, A; Emilio, M; Di Virgilio, A; Evans, M; Fafone, V; Ferrante, I; Fidecaro, F; Fiori, I; Flaminio, R; Fournier, J; Frasca, S; Frasconi, F; Gammaitoni, L; Garufi, F; Genin, E; Gennai, A; Giordano, L; Granata, V; Greverie, C; Grosjean, D; Guidi, G; Hamdani, S; Hebri, S; Heitmann, H; Hello, P; Huet, D; La Penna, R; Laval, M; Leroy, N; Letendre, N; Lopez, B; Lorenzini, M; Losurdo, G; Mackowski, J; Majorana, E; Man, N; Mantovani, M; Marchesoni, F; Marion, F; Marque, J; Martelli, F; Masserot, A; Menzinger, F; Milano, L; Minenkov, Y; Moins, C; Morgado, N; Mosca, S; Mours, B; Neri, I; Nocera, F; Pagliaroli, G; Palomba, C; Paoletti, F; Pardi, S; Pasqualetti, A; Passaquieti, R; Passuello, D; Persichetti, G; Piergiovanni, F; Pinard, L; Poggiani, R; Punturo, M; Puppo, P; Rabaste, O; Rapagnani, P; Regimbau, T; Remillieux, A; Ricci, F; Ricciardi, I; Rocchi, A; Rolland, L; Romano, R; Ruggi, P; Russo, G; Sentenac, D; Solimeno, S; Swinkels, B; Tarallo, M; Terenzi, R; Toncelli, A; Tonelli, M; Tournefier, E; Travasso, F; Vajente, G; van den Brand, J; van der Putten, S; Verkindt, D; Vetrano, F; Vicere, A; Vinet, J; Vocca, H; Yvert, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/33759
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