10-μm Heterodyne Stellar Interferometer

M. A. Johnson, A. L. Betz, and C. H. Townes
Phys. Rev. Lett. 33, 1617 – Published 30 December 1974
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Abstract

A spatial interferometer for 10-μm wavelength which uses two independent telescopes separated by 5.5 m, heterodyne detection of the infrared radiation, and path equalization by a variable-length rf cable, has given interference fringes from radiation of the planet Mercury. Continuous fringe observations during 4000 sec indicate remarkable stability in the optical-path difference through the atmosphere and the two telescopes, fluctuations between 20-sec averages being about 16 of the 10-μm wavelength.

  • Received 17 October 1974

DOI:https://doi.org/10.1103/PhysRevLett.33.1617

©1974 American Physical Society

Authors & Affiliations

M. A. Johnson*, A. L. Betz, and C. H. Townes

  • Department of Physics, University of California, Berkeley, California 94720

  • *National Science Foundation Fellow 1966-1972.

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Vol. 33, Iss. 27 — 30 December 1974

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