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The use of a holographic rejection filter has been demonstrated to improve the sensitivity of a commercial Raman microprobe by a factor of ∼3.5, allowing shorter data accumulation times or a reduction of the laser intensity at the sample. The filter has been tested with two very
different solid samples; the first (TiO2 powder) gives a strong diffusely scattered laser beam along with the Raman scatter. The second (silicon) gives a strong specular reflection of the laser beam, again severely testing the laser rejection capabilities of the filter. Bands down
to 200 cm−1 shift were transmitted by the filter without attenuation but with satisfactory rejection of the laser line. This approach provides a simple way of enhancing the performance of a commercial microprobe at low cost.
ICI plc, Wilton Materials Research Centre, P.O. Box 90, Wilton, Middlesbrough, Cleveland TS6 8JE, U.K.
Publication date: May 1, 1992
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The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)