Kerr Gated Raman Spectroscopy

A common problem encountered in Raman spectroscopy is the presence of fluorescence swamping the weaker Raman signal. The Kerr gate Raman collection system removes fluorescence background enabling measurements of even strongly fluorescing samples. Fluorescence is rejected in the time domain with the Kerr gate acting as an optical 'shutter' with ~ 4 ps time resolution. The gate throughput in the open state is as high as 40% with an extinction ratio in the closed state of ~ 10-5. Currently the Kerr gate can be operated in the range 300-700 nm, but it is hoped that this will soon be extended.

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