Characteristics of a Ring Laser for Geodesy.

Details Characteristics of a Ring Laser for Geodesy. Characteristics of a Ring Laser for Geodesy.

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999evga.conf..278s&link_type=abstract

13th Working Meeting on European VLBI for Geodesy and Astrometry, p. 278 - 284

Computer Science

Performance

Scientific paper

Large Ring lasers are not yet used for geophysical applications. C-II is a prototype for such a device and has a square optical path with side 1 m. One difference with the earlier C-I laser testbed - and similarity to an aircraft gyro - is its monolithic construction. It is housed 30 m underground in a New Zealand military bunker. The measured ringdown time of 0.20 ms corresponds to a quality factor 6e+11 and a finesse 9.4e+4. For the observed exit beam power of 10 pW, this gives an angular rotation sensitivity 4 × 10-9 rad/s/sqrt(Hz). C-II performance limits therefore rival those of Sagnac matter-wave gyroscopes (2 × 10-8 rad/s/sqrt(Hz)). This also corresponds to a quantum noise line width of 220 microhertz, consistent with that observed (172 microhertz) in the direct spectrum and with the coefficient of inverse time in the Allan variance plot.

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