Optical modulation techniques for length sensing and control of optical cavities

Barr, B.W. , Huttner, S.H., Taylor, J.R., Sorazu, B., Plissi, M.V. and Strain, K. (2007) Optical modulation techniques for length sensing and control of optical cavities. Applied Optics, 46(31), pp. 7739-7745. (doi:10.1364/AO.46.007739) (PMID:17973018)

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Abstract

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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Barr, Dr Bryan and Sorazu Lucio, Dr Borja and Plissi, Dr Michael and Huttner, Dr Sabina and Strain, Professor Kenneth
Authors: Barr, B.W., Huttner, S.H., Taylor, J.R., Sorazu, B., Plissi, M.V., and Strain, K.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Applied Optics
Publisher:Optical Society of America
ISSN:0003-6935

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
459312Investigations in Gravitational Radiation.Sheila RowanScience & Technologies Facilities Council (STFC)ST/I001085/1Physics and Astronomy