[The key technology of picosecond time-correlated single photon counting spectrometer]

The picosecond time-correlated single photon counting spectrometer developed uses the TCSPC technique and grating splitter technique that can compensate the time spread dynamically and statically. The time spread caused by the conventional optical system can be eliminated completely. The multichannel analyzer is used to measure the fluorescence decay curves and the time-resolved spectrum by opening the time windows. The method for multi-exponential fitting to the fluorescence decay is also used to deal with the data. The system theory and design of the spectrometer are presented in detail, and the process of operation is introduced with the integration of the system. Many standard samples have been measured, and the data have been analyzed and contrasted. Experimental results show that the fluorescence life-span scaled by the spectrometer reaches picosecond distinction, and the spectrometer's sensitivity is single photon counting. Time resolution of the spectrometer is 8.8 ps.