Improved laser test of the isotropy of space

Details Improved laser test of the isotropy of space Improved laser test of the isotropy of space

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phrvl..42..549b&link_type=abstract

Physical Review Letters, vol. 42, Feb. 26, 1979, p. 549-552. NBS-NSF-Navy-supported research.

Physics

Optics

127

Isotropic Media, Laser Mode Locking, Optical Measurement, Space-Time Functions, Electro-Optics, Fabry-Perot Interferometers, Helium-Neon Lasers, Relativity, Sensitivity

Scientific paper

Extremely sensitive readout of a stable 'etalon of length' is achieved with laser frequency-locking techniques. Rotation of the entire electrooptical system maps any cosmic directional anisotropy of space into a corresponding frequency variation. A fractional length change Delta l/l = (1.5 + or - 2.5) x 10 to the -15th, with the expected P2(cos theta) signature was found. This null result represents a 4000-fold improvement on the best previous measurement of Jaseja et al. (1964).

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