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Raman Imaging System with Dual Holographic Grating Tunable Filter

Volume 48, Number 8 (Aug. 1994) Page 1015-1020

Pallister, David M.; Govil, Anurag; Morris, Michael D.; Colburn, Willis S.


A tunable filter is described for microscopic Raman imaging. The filter employes two matched-volume holographic transmission gratings in a dispersion/dedispersion configuration and is useful throughout the visible wavelength region. Average transmission is greater than 75%. The filter performance is demonstrated with brightfield images of a bar target, Raman images of a silicon integrated circuit, and brightfield images of mineral inclusions in glass.