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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 34, Iss. 35 — Dec. 10, 1995
  • pp: 8100–8105

Digital error-signal extraction technique for real-time automatic control of optical interferometers

F. Barone, E. Calloni, L. Di Fiore, A. Grado, L. Milano, and G. Russo  »View Author Affiliations


Applied Optics, Vol. 34, Issue 35, pp. 8100-8105 (1995)
http://dx.doi.org/10.1364/AO.34.008100


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Abstract

We describe an efficient and robust method for the extraction of the longitudinal error signal for the automatic control of optical interferometers, which can also be applied when the uncontrolled optical system spans hundreds of fringes. The method is based on classic modulation techniques (phase modulation, mechanical modulation, etc.), but extends their performances by the use of the information available only at the output photodiode. We digitally implemented such a method by following modular hardware and software architectures. We then tested the whole procedure in the automatic control of a suspended Michelson interferometer, showing its feasibility and the good performances.

© 1995 Optical Society of America

History
Original Manuscript: April 12, 1995
Revised Manuscript: August 3, 1995
Published: December 10, 1995

Citation
F. Barone, E. Calloni, L. Di Fiore, A. Grado, L. Milano, and G. Russo, "Digital error-signal extraction technique for real-time automatic control of optical interferometers," Appl. Opt. 34, 8100-8105 (1995)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-34-35-8100


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References

  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. P. R. Saulson, Fundamentals of Interferometric Gravitational Wave Detectors (World Scientific, Singapore, 1994).
  3. The Virgo Project: final conceptual design of the Italian–French large-base interferometric antenna Virgo for GW Detection, June 1989, of which the authors are proponents and in whose construction the authors are collaborating.
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  8. F. Barone, E. Calloni, R. De Rosa, L. Di Fiore, F. Fusco, L. Milano, G. Russo, “Digital systems for automatic control of optical resonators used as gravitational waves detectors,” in Proceedings of the First European Conference on Smart Structures and Materials, B. Culshaw, P. T. Gardiner, A. McDonach, eds. (IOP, Bristol, UK, 1992), pp. 49–53.
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  10. F. Barone, E. Calloni, R. De Rosa, L. Di Fiore, F. Fusco, L. Milano, G. Russo, “Fringe-counting technique used to lock a suspended interferometer,” Appl. Opt. 33, 1194–1197 (1994). [CrossRef] [PubMed]
  11. F. Barone, R. De Rosa, L. Di Fiore, F. Fusco, A. Grado, L. Milano, G. Russo, “Real-time digital control of optical interferometers by means of the mechanical modulation technique,” Appl. Opt. 33, 7846–7856 (1994). [CrossRef] [PubMed]
  12. F. Barone, E. Calloni, L. Di Fiore, A. Grado, L. Milano, G. Russo, “High-performance modular digital lock-in amplifier,” Rev. Sci. Instrum. 66, 3697–3702 (1995). [CrossRef]
  13. A. V. Oppenheim, G. W. Schafer, Digital Signal Processing (Prentice-Hall, Englewood Cliffs, N.J., 1975).
  14. F. Barone, E. Calloni, L. Di Fiore, A. Grado, L. Milano, G. Russo, “The 3m prototype Michelson interferometer in Napoli,” Virgo Note PJT94-020 (Universitá di Napoli, Naples, Italy, 1994).

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