Patent ID: 8355125
Filing Date: 2013-01-15
Classification: G01J

Abstract:
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, 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.