Dynamics of optical polarizability of liquid water exposed to intense laser light

Variations in the optical properties of pure water induced by a femtosecond laser (wavelength 800 nm, intensity ∼ 10 12 W / c m 2 ) were studied by a pump–probe interferometric technique. Laser photoionization was shown to increase both the refractive index and absorbance of the water. While the abs...

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Bibliographic Details
Published in:Optics letters 2020-01, Vol.45 (1), p.256
Main Authors: Kononenko, Vitali V., Gololobov, Viktor M., Konov, Vitaly I.
Format: Article
Language:English
Subjects:
Femtosecond pulsed lasers
Lasers
Optical properties
Photoionization
Refractivity
Water
Water chemistry
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Summary:Variations in the optical properties of pure water induced by a femtosecond laser (wavelength 800 nm, intensity ∼ 10 12 W / c m 2 ) were studied by a pump–probe interferometric technique. Laser photoionization was shown to increase both the refractive index and absorbance of the water. While the absorption dynamics were found to be in a good agreement with previous studies, the temporal behavior of the refractive index exhibited novel features. It was found that the always-positive refractive index contains distinct peaks at the beginning and end of the laser pulses. This behavior was attributed to the Kerr effect in water molecules and in wet/hydrated electrons produced by photoionization, respectively.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.45.000256