Utilization of a holographic Bragg diffraction filter for Rayleigh line rejection in Raman spectroscopy

Abstract

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.