A tunable pulsed Raman spectrometer capable of probing picosecond processes

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Abstract
A pulsed tunable laser Raman spectrometer is described. The relevant characteristics are: tunability in the range of 355–755 nm, peak power of > 100 kW, pulse duration 3.2 ns, spectral line width < 0.1 cm−1. Raman pulses can be studied in real time with a resolution > 10 ns while Raman spectra can be recorded with an experimental slit width > 0.5 cm−1. The overall performance of the instrument may be compared to that of a conventional cw laser Raman spectrometer having typical power levels of 100 mW. Spectroscopic measurements are discussed which demonstrate the capability of the apparatus to probe Raman processes which occur at the pico and microsecond time scale.

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