Abstract
We have developed the optical Kerr gate fluorescence spectroscopy with a subpicosecond time resolution as a new spectroscopic tool to investigate ultrafast relaxation processes of materials. We have used solid glasses as the Kerr media to obtain the subpicosecond time resolution. The typical Kerr efficiency and the instrumental response function of the system are ∼5% and ∼250 fs, respectively. The method has been applied to measure the ultrafast internal conversion from S 2 to S 1 state of β-carotene in n-hexane solution as the first demonstration. The lifetime of the S 2 state has been determined to be 220 fs.
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