Abstract
The advent of stable and reliable synchronously pumped dye laser systems has greatly improved the measurement of fluorescence decay times in both the picosecond and the nanosecond time domains. When used in conjunction with time-correlated single-photon counting techniques, the enhanced signal-to-noise ratio permits analysis of multicomponent fluorescence such as is obtained in many heterogeneous systems. Examples of this type of analysis are given with particular reference to macromolecular excimer-forming systems in comparison with the analogous free molecules in solution. For picosecond measurements, the non-linear phenomenon of sum frequency generation in anisotropic crystals offers several advantages over single-photon counting techniques. These include improved time resolution, the ability to detect fluorescence in the far red and IR without resort to special red-sensitive photodetectors and the measurement of fluorescence anisotropy. Examples are given of rotational diffusion measurements on the dyes cresyl violet and oxazine.
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