Time-Resolved Resonance Raman Spectroscopy

Resonance Raman spectroscopy measures resonance-enhanced Raman spectra. This resonance-enhancement enables components to be targeted with molecular specificity, by tuning the Raman pump pulse onto an electronic transition of the sample. The apparatus has a ~2 ps time resolution with > 10 cm-1 spectral resolution. The ULTRA OPAs allow independent tuning of the pump and probe beams from UV to IR.

The figure below shows a typical layout for a time-resolved Raman spectroscopy experiment, with OPAs driven by the 800 nm output (red) of a titanium sapphire amplifier laser. The pump laser (blue) initiates some process, the dynamics of which are probed by a second time delayed beam (green). Raman scattering (green dotted line) of the sample is collected and sent through the spectrometer to a CCD detector. A Kerr gate system driven by a time delayed third beam from the laser output can be used to remove fluorescence background from the Raman signal.

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