Raman spectra have been observed to within less than 200 cm −1 of the Rayleigh line through the use of a holographic Bragg diffraction (HBD) filter. The HBD filter has a very high optical density (5.8 OD) while maintaining a relatively high and flat transmission in the region >200 cm −1 . Utilization of an HBD filter allowed the observation of Raman spectra with a compact 0.125-mm spectrograph. Spectra of solid, liquid, and surface-enhanced Raman (SER) samples have been demonstrated with the HBD Raman system.
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Carrabba et al. (1990) studied this question.
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