Rakhmanov, M. and Evans, M. and Yamamoto, H. (1999) An optical vernier technique for in situ measurement of the length of long Fabry-Pérot cavities. Measurement Science and Technology, 10 (3). pp. 190-194. ISSN 0957-0233 http://resolver.caltech.edu/CaltechAUTHORS:RAKRAKmst99
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We propose a method for in situ measurement of the length of kilometre-sized Fabry-Pérot cavities in laser gravitational wave detectors. The method is based on the vernier, which occurs naturally when the laser beam incident on the cavity has a sideband. By changing the length of the cavity over several wavelengths we obtain a set of carrier resonances alternating with sideband resonances. From the measurement of the separation between the carrier and a sideband resonance we determine the length of the cavity. We apply the technique to the measurement of the length of a Fabry-Pérot cavity in the Caltech 40m interferometer and discuss the accuracy of the technique.
|Additional Information:||Copyright © Institute of Physics and IOP Publishing Limited 1999. Received 19 May 1998, in final form 12 November 1998, accepted for publication 2 December 1998. Print publication: Issue 3 (March 1999). We are very grateful to G Hu for setting up the data acquisition for the experiment. We also thank S Whitcomb, A Lazzarini, J Camp and A Arodzero for discussions and their comments on the paper. This work is supported by the National Science Foundation of the USA under cooperative agreement PHY-9210038.|
|Subject Keywords:||length measurement, vernier, Fabry-Pérot cavity, cavity length, Pound-Drever signal, LIGO|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||16 Apr 2008|
|Last Modified:||26 Dec 2012 09:57|
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