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Fourier transform spectrometer with a frequency comb light source

  • US 8,917,396 B2
  • Filed: 07/20/2009
  • Issued: 12/23/2014
  • Est. Priority Date: 07/25/2008
  • Status: Expired due to Fees
First Claim
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1. A Fourier transform spectrometer for analyzing a sample comprising:

  • a coherent light source comprising a frequency comb generator having a defined frequency repetition rate, wherein the frequency comb generator is split into two counter propagating beams, one for red-shift and one for blue;

    a two-input two-output Fourier transform interferometer, based on amplitude or wavefront division, comprises a fixed arm and a moving arm and is adapted to separate the coherent light source into two parts, each part following one arm, in order to generate interferences between the two parts and analyzing said two counter propagating beams;

    a differential detection means adapted to obtain the difference between the two resulting interferograms measured at the two outputs of the Fourier transform interferometer; and

    wherein the sample is positioned on the light path between the coherent light source and the Fourier transform interferometer.

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