Raman spectrometer having interferometer with optical substraction filters
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United States of America Patent
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Sep 21, 1993
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N/A
app pub date -
Nov 1, 1991
filing date -
Nov 1, 1991
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Abstract
A spectrometer for Raman spectrometry has a radiation source which provides a beam of radiation directed onto a sample, sample collection optics which directs the radiation from the sample as an input beam into an interferometer, the output beam of the interferometer being focused onto a detector, and filters interposed in the input and output beams of the interferometer. The filters are preferably holographic notch filters. Optical subtraction occurring in the interferometer as a result of the filters provides enhanced attenuation of the Rayleigh line of the reflected radiation while substantially passing the Raman lines, with the two filters achieving attenuation of the Rayleigh line equivalent to that obtained by several comparable filters stacked together.
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