A method to blot out scattered light effects and its application to a gravitational wave detector

Details A method to blot out scattered light effects and its application to a gravitational wave detector A method to blot out scattered light effects and its application to a gravitational wave detector

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jphe...14...65s&link_type=abstract

Journal of Physics E - Scientific Instruments, vol. 14, Jan. 1981, p. 65-70.

Physics

9

Gravitational Waves, Laser Interferometry, Light Scattering, Optical Correction Procedure, Radiation Detectors, Delay Lines, Michelson Interferometers, Noise Spectra, Optical Paths, Phase Modulation

Scientific paper

For the interferometric detection of extremely small displacements one of the principal limiting factors can be scattered light, having a certain path difference against the main beam, in combination with the inevitable frequency fluctuations of the light source. This paper presents a method to suppress the effect originating from the cooperation of these two deficiencies. The idea is to blot out the scattered light effect by deliberately phase-modulating the light with appropriate frequency and phase swing. A theoretical treatment is given for the principles of this novel method. The paper discusses possible sources of scattered light in a gravitational wave detector and the application of the method to blot out the effect caused by the scattered light. It furthermore describes a method to measure the different contributions of scattered light and presents first experimental results for their suppression. Suggestions and calculations for further improvements are given.

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