Double-pass optical interferometer

Details Double-pass optical interferometer Double-pass optical interferometer

1985-05-10

1987-07-07

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

G01J 345, G01B 902

Patent

active

046783334

ABSTRACT:
Apparatus and method for converting a conventional Michelson interferometer into a high resolution double-pass interferometer. The Michelson interferometer includes means for dividing an incident beam of radiation into first and second beams, means for propagating the first and second beams through first and second optical paths, respectively, means for recombining the first and second beams to form an output beam of radiation, and means for detecting an interference pattern in the output beam of radiation. The improvement comprises a beam splitter which is positioned to return a portion of the output beam of radiation to the interferometer as an incident beam of radiation, and a bandpass filter which is positioned between the beam splitter and the detector to filter from the output beam of radiation a portion which has been twice passed through the interferometer.

REFERENCES:
Hariharan et al., "Fringes of Equal Inclination in the Double-Passed Michelson Interferometer" J. Opt. Soc. Am., vol. 51, No. 6, pp. 617-619, Jun. 1961.

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