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Time-Resolved Spectroscopy Of Evanescent-Wave Excited Fluorescence

An experimental proof of principle system for making time-resolved spectrographic measurements of laserinduced fluorescence in organics undergoing shock wave loading has been developed. The source of excitation is a flashlamp-pump dye laser and the detector is a 0.2m spectrograph coupled to an Imacon 500 streak camera. The sample, in liquid solution, is excited in an evanescent-wave geometry, which results in only a very thin (≈ 1000 Å) layer of sample being excited. Excitation of such a thin layer is required to obtain high time resolution in samples undergoing shock wave loading, which is the intended application for this technique. Optical time resolution of 100 psec has been achieved, and shorter time scales appear within easy reach.