Time resolution and characteristics of a broadband picosecond continuum and light gate

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Abstract
A broadband continuum which last a few picoseconds can be generated in isotropic materials such as liquid H2O or D2O by single picosecond pulse excitation. It is demonstrated that the blue part of the spectrum is delayed relative to the red portion. A spectral analysis reveals a stimulated inverse Raman band around 260 cm−1 to the blue of the first anti‐stokes emission. We offer two alternative explanations for this observation. The open time of the light gate is shown to depend on various parameters and in the case of a CS2 shutter, it may be extended over much longer time intervals than the pulse duration. At the same time we have observed depolarization and isotropic scattering of the interrogating light.
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