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All reflective apparatus for injecting excitation light and collecting in-elastically scattered light from a sample

  • US 8,355,125 B2
  • Filed: 05/24/2010
  • Issued: 01/15/2013
  • Est. Priority Date: 06/02/2009
  • Status: Active Grant
First Claim
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1. An apparatus for launching optical radiation onto a sample and for collecting in-elastically scattered radiation from a sample comprising:

  • a first parabolic off-axis reflector which focuses nominally collimated radiation onto a sample and collects scattered radiation from the sample;

    an optical window optically located between the first reflector and the sample, the optical window configured such that radiation in-elastically scattered due to the optical window has a first spectrum that does not interfere with a second spectrum of the in-elastically scattered radiation from the sample;

    at least one filter, wherein a filter nearest the first off-axis reflector reflects radiation from an optical source such that it is intercepted by the first off-axis reflector, and wherein the filter nearest the first off-axis reflector transmits in-elastically scattered radiation reflected by the first off-axis reflector,the filter nearest the first off-axis reflector being disposed at an angle such that a beam from the optical source, prior to its incidence on the filter will not be substantially intercepted by the first off-axis reflector;

    a second parabolic off-axis reflector which focuses the radiation transmitted by the filter nearest the first off-axis reflector; and

    wherein the apparatus is further configured such that the radiation focused by the second parabolic off-axis reflector has not been transmitted by any transmissive optics capable of in-elastically scattering radiation other than the optical window.

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