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Extending a continuous scan Fourier transform spectrometer for time-resolved Fourier transform spectroscopy with ≪0.5 cm-1 spectral and ≪10 ns time resolution in the visible region

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4 Author(s)
Lindner, Jorg ; Institut für Quantenoptik, Universität Hannover, Welfengarten 1, D 30167 Hannover, Germany ; Stahlhut, Oliver ; Wilhelm, Ralf ; Ermisch, Karsten

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The extension of a continuous scan high spectral resolution (0.006 cm-1) Fourier transform spectrometer for time-resolved Fourier transform spectroscopy with a temporal resolution in the ns regime is described. The time resolution is achieved by synchronizing a laser/transient digitizer system with the interferometer. The realization of the data acquisition and the experimental setup are described. Examples of time-resolved measurements are given. Detector limited temporal resolution of ≪10 ns is shown by recording scattered light from a pulsed dye laser. Spectral resolution of ≪0.5 cm-1 is demonstrated by observing the fluorescence of electronically excited CH radicals produced in the multi photon dissociation of CHBr3. The signal-to-noise behavior of time-resolved Fourier transform apparatus is investigated as a function of spectral (0.1–4.0 cm-1 unapodized) and time resolution and of the intensity of the detected light. © 1998 American Institute of Physics.

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Review of Scientific Instruments  (Volume:69 ,  Issue: 4 )