Control of the laser frequency of the Virgo gravitational wave interferometer with an in-loop relative frequency stability of 1.0 x 10(-21) on a 100 ms time scale

F. Acernese*, M. Alshourbagy, F. Antonucci, S. Aoudia, K.G. Arun, P. Astone, G. Ballardin, F. Barone, M. Barsuglia, T.S. Bauer, M. Beker, S. Bigotta, S. Birindelli, M.A. Bizouard, C. Boccara, F. Bondu, L. Bonelli, L. Bosi, S. Braccini, C. BradaschiaA. Brillet, V. Brisson, H.J. Bulten, D. Buskulic, G. Cagnoli, E. Calloni, E. Campagna, B. Canuel, F. Carbognani, L. Carbone, F. Cavalier, R. Cavalieri, G. Cella, E. Chassande-Mottin, S. Chatterji, A. Chincarini, F. Cleva, E. Coccia, J. Colas, A. Colla, M. Colombini, C. Corda, A. Corsi, J.P. Coulon, E. Cuoco, S. D'Antonio, A. Dari, V. Dattilo, M. Davier, R. Day, S. Hild, J.F.J. van den Brand

*Corresponding author for this work

Research output: Contribution to conferencePaperAcademic


The measurement of the space-time structure variations induced by strong cosmic events (supernovae, coalescing binaries of neutron stars, etc.) requires an oscillator with a relative stability of 10(-21) on time scales typically approximate to 100 ms. We demonstrate that the Virgo interferometer with a wavelength of 1.064 mu m has a laser frequency with an in-loop stability of 1.0 x 10(-21) on a 100 ms time scale, and an in-loop frequency noise of 2 x 10(-7) Hz/root Hz at 10 Hz. We show that this fits the specifications. Two references successively stabilize the laser frequency. The first one is a 144 m long suspended cavity; the second one is the common mode of two perpendicular 3 km long Fabry-Perot cavities. The differential mode of the relative length variations of these two optical cavities is the port where we expect the signal for the gravitational waves; this out-of-loop measurement, less sensitive to laser frequency noise, does not show up correlations with the in-loop error signal. This is the best ever performance of short term laser frequency stabilization reported.
Original languageEnglish
Number of pages3
Publication statusPublished - 1 Jan 2009
Externally publishedYes

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