Physics – Optics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985rpeee.......75g&link_type=abstract
In its USSR Rept.: Electron. and Elect. Eng. (JPRS-UEE-85-001) p 75-76 (SEE N85-22976 13-33) Transl. into ENGLISH from Radiote
Physics
Optics
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.
Dubrov M. N.
Gorshkov A. S.
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