Geophysical laser interferometer with 12.5 meter base

Physics – Optics

Scientific paper

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Laser Interferometry, Michelson Interferometers, Seismology, Acousto-Optics, Beam Splitters, Optical Waveguides, Strain Measurement, Telescopes

Scientific paper

The long-base laser interferometer installed in Garm (TaSSR) for geophysical observations during seismic activity includes a Lamb-stabilized LG-32 laser (wavelength 0.63 micrometer), a matching telescope, a light beam splitter with a pair of plane 45 deg mirrors behind, a protective straight light guide, and a reversing plane 90 deg mirror at the other end. The base length, namely the distance between light splitter and reversing mirror, is 12.5 m and the path difference in this asymmetric Michelson interferometer is 25 m. The interference-type phase meter contains an acoustooptic modulator. This instrument recorded strains within the 0 to 1 Hz frequency range, as well as a local earthquake during December 1978. A high-frequency stability for high accuracy of strain measurements requires decoupling the laser, increasing the diameter of the light guide, and decreasing the diameter of the light beam.

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