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Ring resonant cavities for spectroscopy

  • US 5,912,740 A
  • Filed: 06/20/1997
  • Issued: 06/15/1999
  • Est. Priority Date: 06/20/1997
  • Status: Expired due to Term
First Claim
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1. An optical system for performing an absorption measurement, said system comprising:

  • a) a light source for generating light comprising a wavelength corresponding to an absorption region of interest of a sample;

    b) a ring resonant cavity in optical communication with said light source, wherein said cavity defines an intracavity light path, light emitted by said light source is incident on an input of said cavity, follows said light path, and extends from an output of said cavity, and said sample is situated in said light path; and

    c) a detection means in optical communication with said output, for detecting an intensity of light of said wavelength extending from said output;

    wherein said light emitted by said light source is not normal to said input, whereby light extending from said input is directed away from said light source.

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