Study on the interaction of intense femtosecond laser pulses with nanometre-sized hydrogen clusters |
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Authors: | Zheng Li Wang Cheng Li Shao-Hui Liu Bing-Chen Ni Guo-Quan Li Ru-Xin and Xu Zhi-Zhan |
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Institution: | State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China |
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Abstract: | The interaction of intense femtosecond laser pulses with hydrogen clusters
has been experimentally studied. The hydrogen clusters were produced from
expansion of high-pressure hydrogen gas (backed up to 8\tm106Pa) into vacuum
through a conical nozzle cryogenically cooled by liquid nitrogen. The
average size of hydrogen clusters was estimated by Rayleigh scattering
measurement and the maximum proton energy of up to 4.2keV has been obtained
from the Coulomb explosion of hydrogen clusters under 2×1016 W/cm2 laser irradiation. Dependence of the maximum proton energy on cluster size and laser intensity was
investigated, indicating the correlation between the laser intensity and the
cluster size. The maximum proton energy is found to be directly proportional
to the laser intensity, which is consistent with the theoretical prediction. |
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Keywords: | protons hydrogen clusters intense femtosecond laser pulse |
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