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.
David M. Pallister, Anurag Govil, Michael D. Morris, and Willis S. Colburn, "Raman Imaging System with Dual Holographic Grating Tunable Filter," Appl. Spectrosc. 48, 1015-1020 (1994)
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