Abstract
The application of a picosecond-pulsed laser system, in conjunction with a time-to-amplitude converter, to the suppression of fluorescence noise in Raman spectra is described. Enhancements of 14.6 (Raman signal/fluorescence background) and 2.8 (Raman signal/fluorescence noise) were obtained for a solution of benzene doped with a fluorophore with lifetime tau f=11.8 ns, while corresponding improvements of 5.5 and 2.0 were observed for a dopant with tau f=3.9 ns. When the samples studied exhibited non-Poisson fluctuations in background intensity, the signal-to-noise enhancement was much greater (7.2). Calculations are presented which successfully model the signal-to-noise enhancement as a function of tau f and the detector timing resolution. These calculations have been verified experimentally over a wide range of gate widths and positions. The importance of the Raman signal/fluorescence noise ratio rather than the Raman signal/fluorescence background level is stressed.
Keywords
Raman spectroscopyFluorescenceFluorophoreNoise (video)PicosecondSIGNAL (programming language)Coherent anti-Stokes Raman spectroscopyLaser-induced fluorescenceAnalytical Chemistry (journal)LaserOpticsPhoton countingMaterials scienceChemistryRaman scatteringDetectorPhysics
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Publication Info
- Year
- 1986
- Type
- article
- Volume
- 19
- Issue
- 11
- Pages
- 934-943
- Citations
- 27
- Access
- Closed
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Cite This
J.A.K. Howard,
Neil Everall,
R. W. Jackson
et al.
(1986).
Fluorescence rejection in Raman spectroscopy using a synchronously pumped, cavity-dumped dye laser and gated photon counting.
Journal of Physics E Scientific Instruments
, 19
(11)
, 934-943.
https://doi.org/10.1088/0022-3735/19/11/013
Identifiers
- DOI
- 10.1088/0022-3735/19/11/013