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Iodine-stabilized Nd:YAG laser applied to a long-baseline interferometer for wideband earth strain observations.
- Source :
-
Review of Scientific Instruments . Jun2002, Vol. 73 Issue 6, p2434. 6p. - Publication Year :
- 2002
-
Abstract
- We stabilized a frequency-doubled Nd:YAG laser (λ=532 nm) with reference to an iodine absorption line, and applied it to a long-baseline interferometer for earth strain observations. To obtain unmodulated light, saturated absorption signals of an external iodine cell were detected by the modulation transfer technique using an acousto-optic modulator working as both amplitude and frequency modulators. Two feedback loops, which could control the laser frequency by a piezo-electric actuator and a thermal actuator, realized fast and wide-range frequency stabilization, and ensured long-term stable operation. From a beat-note measurement between two identical systems, we obtained a frequency stability (in Allan variance) of ...2 x 10[sup -13] for time intervals of 10 to 1000 s. By applying the stabilized Nd:YAG laser to a light source of a 10 m interferometer, we successfully observed earth tides and earthquakes in strain variations. Other geophysical signals, detectable by this strainmeter, are also discussed. [ABSTRACT FROM AUTHOR]
- Subjects :
- *LASERS
*SCIENTIFIC apparatus & instruments
Subjects
Details
- Language :
- English
- ISSN :
- 00346748
- Volume :
- 73
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Review of Scientific Instruments
- Publication Type :
- Academic Journal
- Accession number :
- 6702733
- Full Text :
- https://doi.org/10.1063/1.1477606