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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 31 — Nov. 1, 2007
  • pp: 7739–7745

Optical modulation techniques for length sensing and control of optical cavities

B. W. Barr, S. H. Huttner, J. R. Taylor, B. Sorazu, M. V. Plissi, and K. A. Strain  »View Author Affiliations

Applied Optics, Vol. 46, Issue 31, pp. 7739-7745 (2007)

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We present a discussion of the use of amplitude modulation techniques with regard to the length sensing and control of optical cavities for laser interferometric gravitational-wave detectors. Traditional radio-frequency amplitude modulation techniques automatically include phase modulation as a product of the modulation process, which can contaminate the signal after demodulation. In particular, with many length-sensing and control schemes the detected signals are demodulated in quadrature, which, in the case of a traditional amplitude modulation scheme, will result in offsets due to the additional phase modulation. We demonstrate this effect using a simple optical cavity configuration and show that minor adjustments to the modulator system can be used to compensate for the extra modulation components and provide additional flexibility.

© 2007 Optical Society of America

OCIS Codes
(230.0230) Optical devices : Optical devices
(230.2090) Optical devices : Electro-optical devices
(230.4110) Optical devices : Modulators
(230.5440) Optical devices : Polarization-selective devices

ToC Category:
Optical Devices

Original Manuscript: February 27, 2007
Manuscript Accepted: July 20, 2007
Published: October 26, 2007

B. W. Barr, S. H. Huttner, J. R. Taylor, B. Sorazu, M. V. Plissi, and K. A. Strain, "Optical modulation techniques for length sensing and control of optical cavities," Appl. Opt. 46, 7739-7745 (2007)

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