Double-pass optical interferometer
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United States of America Patent
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Jul 7, 1987
Grant Date -
N/A
app pub date -
May 10, 1985
filing date -
May 10, 1985
priority date (Note) -
Expired
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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.
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