Filamentary plasma grating induced by interference of two femtosecond laser pulses in water

We present direct observation of filamentary plasma grating induced by interference between two noncollinear infrared femtosecond pulses in water by doping with gold nanoparticles. The gold nanoparticles act as scattering media in water and visualize the fine structure of local optical fields of pla...

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Bibliographic Details
Published in:Optics express 2017-09, Vol.25 (19), p.22303-22311
Main Authors: Liu, Fengjiang, Yuan, Shuai, He, Boqu, Nan, Junyi, Jiang, Mengci, Khan, Abdul Qayyum, Ding, Liang'en, Yu, Jiaxin, Zeng, Heping
Format: Article
Language:English
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Summary:We present direct observation of filamentary plasma grating induced by interference between two noncollinear infrared femtosecond pulses in water by doping with gold nanoparticles. The gold nanoparticles act as scattering media in water and visualize the fine structure of local optical fields of plasma grating. By measuring the variation of local conductivity as laser undergoes filamentation in water, the generated electron density in water is qualitatively studied. Significant enhancement of local electron density is observed at the intersecting region as two laser beams form plasma grating, indicating the breakthrough of clamped intensity of a conventional filament in water.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.25.022303