Time correlated single photon counting (TCPSC) is a technique to measure light intensities with picosecond resolution. Its main application is the detection of fluorescent light. A pulsed light source excites a fluorescent sample. A single photon detector records the emitted fluorescence photons. Thus, per excitation cycle, only a single photon is detected. Fast detection electronics records the time between the excitation pulse and the detection of the fluorescence photon. A histogram accumulates multiple detected photons to yield a time-resolved fluorescence intensity decay.

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