A New Type of Two-photon Forward Radiation in Pure Liquids

Details A New Type of Two-photon Forward Radiation in Pure Liquids A New Type of Two-photon Forward Radiation in Pure Liquids

2007-06-16

arxiv.org/abs/0706.2408v1

Physics

Chemical Physics

4 pages, 4 figures

Scientific paper

Unexpected spectral features are observed in the two photon spectrum of the pure water in the forward direction when an 80 femtosecond laser pulse is focused at 10^10Wcm-2 or less. Such intensity is much lower than the breakdown or stimulated threshold of the liquid water. The two broad features are about 2700cm-1 and 5000cm-1 red shifted from the hyper-Rayleigh wavelength, respectively, and they are quadratic with the laser intensity. They do not match the known Raman or hyper-Raman frequencies of water, and they are both centered at a narrow angle in the forward direction. Several other liquids also exhibited similar but molecular specific spectral features.

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