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Multiplex and multichannel detection of near-infrared Raman scattering

The last five years have seen the rapid development and utilization of Raman Spectroscopy done with near infrared iasersL23. The major advantage of working in this spectral region is the almost total elimination fluorescence background problems normally encountered in Raman experiments utilizing visible excitation. There is, however a price to be paid. Since the Raman scattering cross-section follows a n4 law, the intensity of the Raman effect in the near infrared is approximately twenty times weaker than in the visible. This fact, coupled with the absence of good, shot noise limited detectors in the near infrared, dictates that spectral sensitivity will be low. In order to compensate for this loss in sensitivity, the obvious approach was to use a multiplexing spectrometer such as a Michelson interferometer. The performance of such a system proved to be superior to that possible using dispersive, single channel methods in the near infrared. The recent introduction of multichannel detectors, with sensitivities at wavelengths beyond one micron has changed this situation