Time-Gated Raman Spectroscopy , Time-resoved Raman Spectroscopy, Pulsed Raman Spectroscopy

Time-gated pulsed Raman spectroscopy is a technique that utilises a nanosecond (ns) laser to excite a sample and subsequently captures the Raman-scattered light, which is then measured using a time-gated detector. Raman scattering, being an instant process, is contrasted by the duration of fluorescence and other background signals (including ambient light), which persist over a greater time scale. The detector is therefore gated to open only during the very brief time window when the Raman signal arrives. This configuration enables the system to effectively reject both long-lived fluorescence and ambient light, which are common sources of interference in conventional Raman spectroscopy. Consequently, Time-Gated Pulsed Raman Spectroscopy facilitates the acquisition of clear, high-contrast Raman spectra, even in well-lit environments or on highly fluorescent materials. This capacity renders the technique especially useful for in situ applications in cultural heritage analysis, without the necessity for darkroom conditions.

Remote raman/lif spectroscopy

23/04/2025