Large-scale laser gravitational interferometer with suspended mirrors for fundamental geodynamics

Valentin N. Rudenko; Victor V. Kulagin; Sergei L. Pasynok; Andrei V. Serdobolskii

doi:10.1117/12.420965

23 March 2001 Large-scale laser gravitational interferometer with suspended mirrors for fundamental geodynamics

Valentin N. Rudenko, Victor V. Kulagin, Sergei L. Pasynok, Andrei V. Serdobolskii

Proceedings Volume 4350, Laser Optics 2000: Solid State Lasers; (2001) https://doi.org/10.1117/12.420965
Event: Laser Optics 2000, 2000, St. Petersburg, Russian Federation

Abstract

A Fabry-Perot-Michelson gravitational free mass interferometer is considered for a registration of the low frequency Earth gravity gradients. A variation of the Earth gravity force vector cause the corresponding misalignment of the interferometer mirrors thus providing information about the Earth gravity field. Gravitational interferometer with suspended mirrors provides a unique possibility to measure a relative angle variation between two plumb lines (gravity force vectors) separated by the large distance 3divided by4 km. So at very low frequencies the setup presents a long based angular gravity gradiometer for registering global geodynamics through the surface gravity gradient. A possibility of measuring the geophysical phenomena resulted in gravity field variations (core movements, Earth free oscillations, tidal harmonics, Earth rotation variations, etc.) Is discussed and technical requirements for the setup optical elements are formulated. Comparison with conventional geophysical devices is carried out. Estimates of the basic instrumental and seismic noises limiting sensitivity at low frequency (in the quasi-static regime) are discussed briefly. These estimates show that there is a hope for measurement of the gravitational angular perturbation of the mirrors at the level of 10^-12divided by10^-13 rad for the observation time about several hours. The possibility of arm signals reconstruction in the presence of recycling mirror is demonstrated. The auxiliary optical system for precise justification between up-down movements and tilts of the end spherical mirrors is considered. The requirements on the stability of laser system are discussed.

Citation Download Citation

Valentin N. Rudenko, Victor V. Kulagin, Sergei L. Pasynok, and Andrei V. Serdobolskii "Large-scale laser gravitational interferometer with suspended mirrors for fundamental geodynamics", Proc. SPIE 4350, Laser Optics 2000: Solid State Lasers, (23 March 2001); https://doi.org/10.1117/12.420965

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