Peter T Beyersdorf et al 2002 Class. Quantum Grav. 19 1585 doi:10.1088/0264-9381/19/7/348
Results from the Stanford 10 m Sagnac interferometer
Peter T Beyersdorf, Robert L Byer and Martin M Fejer
Show affiliationsThe design of a 10 m all-reflective prototype Sagnac interferometer with suspended optics is described and the experimental results are presented. It uses a polarization scheme to allow detection of the dark fringe on the symmetric port of the beamsplitter for optimal interference contrast. The necessary low-frequency response of the interferometer requires delay lines in the arms. To deal with the noise introduced by scattered light in the delay lines, a laser frequency sweep frequency shifts the scattered light so that it does not produce noise near zero frequency. This results in a shot-noise-limited phase sensitivity of Δ
= 1.6 × 10−9 rad Hz−1/2 at frequencies as low as 200 Hz. Scaling this prototype to several kilometres with kilowatts of circulating power requires several technical improvements in high-power solid-state lasers, second harmonic generation and the fabrication of large mirrors, which are likely to be made in the next 10 years.
- PACS
- MSC
- Subjects
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Instrumentation and measurement
- Dates
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Issue 7 (7 April 2002)
Received 29 October 2001, in final form 18 January 2002
Published 14 March 2002
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Results from the Stanford 10 m Sagnac interferometer
Peter T Beyersdorf et al 2002 Class. Quantum Grav. 19 1585
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