Ultrafast electron beam imaging of femtosecond laser-induced plasma dynamics

Junjie Li; Xuan Wang; Zhaoyang Chen; Richard Clinite; Samuel S. Mao; Pengfei Zhu; Zhengming Sheng; Jie Zhang; Jianming Cao

doi:10.1063/1.3380846

Ultrafast electron beam imaging of femtosecond laser-induced plasma dynamics

Junjie Li, Xuan Wang, Zhaoyang Chen, Richard Clinite, Samuel S. Mao, Pengfei Zhu, Zhengming Sheng, Jie Zhang, Jianming Cao

Mechanical & Nuclear Engineering

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

Plasma dynamics in the early stage of laser ablation of a copper target are investigated in real time by making ultrafast electron shadow images and electron deflectometry measurements. These complementary techniques provide both a global view and a local perspective of the associated transient electric field and charge expansion dynamics. The results reveal that the charge cloud above the target surface is composed predominantly of thermally ejected electrons and that it is self-expanding, with a fast front-layer speed exceeding 10⁷ m/s. The average electric field strength of the charge cloud induced by a pump fluence of 2.2 J/ cm² is estimated to be ∼2.4× 10⁵ V/m.

Original language	British English
Article number	083305
Journal	Journal of Applied Physics
Volume	107
Issue number	8
DOIs	https://doi.org/10.1063/1.3380846
State	Published - 15 Apr 2010

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title = "Ultrafast electron beam imaging of femtosecond laser-induced plasma dynamics",

abstract = "Plasma dynamics in the early stage of laser ablation of a copper target are investigated in real time by making ultrafast electron shadow images and electron deflectometry measurements. These complementary techniques provide both a global view and a local perspective of the associated transient electric field and charge expansion dynamics. The results reveal that the charge cloud above the target surface is composed predominantly of thermally ejected electrons and that it is self-expanding, with a fast front-layer speed exceeding 107 m/s. The average electric field strength of the charge cloud induced by a pump fluence of 2.2 J/ cm2 is estimated to be ∼2.4× 105 V/m.",

author = "Junjie Li and Xuan Wang and Zhaoyang Chen and Richard Clinite and Mao, {Samuel S.} and Pengfei Zhu and Zhengming Sheng and Jie Zhang and Jianming Cao",

note = "Funding Information: This work was supported by the National Science Foundation under Grant No. .",

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T1 - Ultrafast electron beam imaging of femtosecond laser-induced plasma dynamics

AU - Li, Junjie

AU - Wang, Xuan

AU - Chen, Zhaoyang

AU - Clinite, Richard

AU - Mao, Samuel S.

AU - Zhu, Pengfei

AU - Sheng, Zhengming

AU - Zhang, Jie

AU - Cao, Jianming

N1 - Funding Information: This work was supported by the National Science Foundation under Grant No. .

PY - 2010/4/15

Y1 - 2010/4/15

N2 - Plasma dynamics in the early stage of laser ablation of a copper target are investigated in real time by making ultrafast electron shadow images and electron deflectometry measurements. These complementary techniques provide both a global view and a local perspective of the associated transient electric field and charge expansion dynamics. The results reveal that the charge cloud above the target surface is composed predominantly of thermally ejected electrons and that it is self-expanding, with a fast front-layer speed exceeding 107 m/s. The average electric field strength of the charge cloud induced by a pump fluence of 2.2 J/ cm2 is estimated to be ∼2.4× 105 V/m.

AB - Plasma dynamics in the early stage of laser ablation of a copper target are investigated in real time by making ultrafast electron shadow images and electron deflectometry measurements. These complementary techniques provide both a global view and a local perspective of the associated transient electric field and charge expansion dynamics. The results reveal that the charge cloud above the target surface is composed predominantly of thermally ejected electrons and that it is self-expanding, with a fast front-layer speed exceeding 107 m/s. The average electric field strength of the charge cloud induced by a pump fluence of 2.2 J/ cm2 is estimated to be ∼2.4× 105 V/m.

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Ultrafast electron beam imaging of femtosecond laser-induced plasma dynamics

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