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Direct waveform recording provides high SNR. Signal-to-noise ratio (SNR, defined as signal/SD) was measured for 1000 successive acquisitions with 0.2 ns resolution. (a) SNR waveform of rhodamine 6G (1 μM in water) acquired with 200 cycle averaging of each waveform; (b) Representative values of peak SNR of rhodamine 6G with varied number of cycles averaged. Peak SNR was highest (580) at low PMT voltage (400 V, black squares) and dropped to 360 at high PMT voltage (500 V, blue diamonds).
