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Optical coherence tomography with new interferometer

  • US 6,053,613 A
  • Filed: 05/15/1998
  • Issued: 04/25/2000
  • Est. Priority Date: 05/15/1998
  • Status: Expired due to Term
First Claim
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1. An optical coherence tomography apparatus ("OCT") which examines an object, which OCT apparatus comprises:

  • a source of short coherence radiation;

    a coupler which;

    (a) couples a first portion of the radiation to a reference arm;

    (b) couples a second portion of the radiation to a sample arm;

    (c) combines radiation transmitted thereto from the reference arm and the sample arm; and

    (d) couples the combined radiation to an analyzer;

    wherein;

    the reference arm transmits the first portion of the radiation to a measurement range variation apparatus and transmits radiation output from the measurement range variation apparatus back to the coupler;

    the sample arm transmits the second portion of the radiation to the object and transmits radiation scattered by the object back to the coupler; and

    the measurement range variation apparatus comprises;

    a transmitter which transmits a portion of the radiation incident thereupon;

    a reflector which reflects radiation transmitted by the transmitter, which transmitter reflects a portion of the reflected radiation; and

    a scanner coupled to scan the reflector.

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