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Applied Optics

Applied Optics


  • Vol. 33, Iss. 7 — Mar. 1, 1994
  • pp: 1194–1197

Fringe-counting technique used to lock a suspended interferometer

Fabrizio Barone, Enrico Calloni, Rosario De Rosa, Luciano Di Fiore, Francesco Fusco, Leopoldo Milano, and Guido Russo  »View Author Affiliations

Applied Optics, Vol. 33, Issue 7, pp. 1194-1197 (1994)

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We implement a digital fringe-counting technique to measure in real time the relative mirror displacement of a suspended Michelson interferometer with modulated optical path length for oscillations much larger than the laser wavelength (λ). This provides the proper error signal for a servo mechanism that reduces the relative displacement within λ/2. The implemented technique does not require extra optics or polarizers and thus can be used for interferometric gravitational wave detectors as a starting procedure to get the system locked.

© 1994 Optical Society of America

Original Manuscript: November 3, 1992
Revised Manuscript: May 25, 1993
Published: March 1, 1994

Fabrizio Barone, Enrico Calloni, Rosario De Rosa, Luciano Di Fiore, Francesco Fusco, Leopoldo Milano, and Guido Russo, "Fringe-counting technique used to lock a suspended interferometer," Appl. Opt. 33, 1194-1197 (1994)

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  1. For a review of GW interferometric detectors see, for example, The Detection of Gravitational Waves, D. G. Blair, ed. (Cambridge U. Press, Cambridge, 1991). [CrossRef]
  2. C. Bradaschia, R. Del Fabbro, L. Di Fiore, A. Di Virgilio, A. Giazotto, H. Kautzky, V. Montelatici, D. Passuello, “First results on the electronic cooling of the Pisa seismic noise super-attenuator for gravitational wave detection,” Phys. Lett. A 137, 329–333 (1989). [CrossRef]
  3. The Virgo Project, a proposal by a collaboration of 38 physicists of the Italian–French large base interferometric antenna Virgo for GW detection, June 1989, of which F. Barone, L. Di Fiore, L. Milano, and G. Russo are members.
  4. A. Augurio, F. Barone, E. Calloni, L. Di Fiore, L. Milano, G. Russo, S. Solimeno, “Automatic control system for mirrors alignment of interferometric antenna Virgo,” presented at the Sixth Marcel Grossman Meeting on General Relativity, Kyoto, Japan, 23–29 June 1991.
  5. A. Sona, “Laser in metrology: distance measurements,” in Laser Handbook, F. T. Arecchi, E. O. Shulz-Dubois, eds. (North-Holland, Amsterdam, 1972), Vol. 2, pp. 1457–1486.
  6. H. J. Tiziani, “Optical methods for precision measurements,” Opt. Quantum Electron. 21, 253–282 (1989). [CrossRef]

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