Abstract
A new method of measuring fluorescence lifetime which is much shorter than the pulse width was developed using an optical Kerr shutter and incoherent light. While a sample was excited by second harmonic light of the output pulse of a Q-switched YAG laser, an optical Kerr shutter was gated with the fundamental light of the same laser pulse. The transmitted intensity of the fluorescence through the Kerr shutter was measured by changing the delay time between the second harmonic and the fundamental light. A resolution time of 30 ps was obtained by using a Q-switched YAG laser pulse of 7 ns duration.
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