Laser earth‐strain gauge to search for gravity waves
作者:
Marian S. Rothenberg,
期刊:
Physics Today
(AIP Available online 1971)
卷期:
Volume 24,
issue 6
页码: 19-20
ISSN:0031-9228
年代: 1971
DOI:10.1063/1.3022788
出版商: AIP
数据来源: AIP
摘要:
An extremely stable laser developed at the Joint Institute for Laboratory Astrophysics, Boulder, Colorado, is providing a sensitive way to measure earth strain. Judah Levine and John L. Hall have built an interferometric strain gauge whose key element is a methane‐stabilized 3.39‐micron helium–neon laser at the Poorman's Relief Mine near Boulder. The stabilized He–Ne laser is beat against a second He–Ne laser locked to a 30‐meter Fabry–Perot interferometer and fluctuations in the beat frequency are a direct measure of changes in the 30‐meter path length.
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