Ultrafast imaging the light-speed propagation of a focused femtosecond laser pulse in air and its ionized electron dynamics and plasma-induced pulse reshaping

Yanwu Yu, Lan Jiang, Qiang Cao, Xueshong Shi, Qingsong Wang, Guoyan Wang, Yongfeng Lu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The light-speed propagation of a focused femtosecond (fs) laser pulse in air was recorded by a pump–probe shadowgraph imaging technique with femtosecond time resolution. The ultrafast dynamics of the laser-ionized electrons were studied, which revealed a strong reshaping of the laser field due to laser–air nonlinear interaction. The influence of laser fluence and focusing conditions on the pulse reshaping was studied, and it was found that: (1) double foci are formed due to the refocusing effect when the laser fluence is higher than 500 J/cm2 and the focusing numeric aperture (NA) is higher than 0.30; and (2) a higher NA focusing lens can better inhibit the prefocusing effect and nonlinear distortion in the Gaussian beam waist.

Original languageEnglish (US)
Article number205
JournalApplied Physics A: Materials Science and Processing
Volume122
Issue number3
DOIs
StatePublished - Mar 1 2016

Fingerprint

Light velocity
Ultrashort pulses
Plasmas
Imaging techniques
Electrons
Lasers
Air
Nonlinear distortion
Gaussian beams
Laser pulses
Lenses

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

Cite this

Ultrafast imaging the light-speed propagation of a focused femtosecond laser pulse in air and its ionized electron dynamics and plasma-induced pulse reshaping. / Yu, Yanwu; Jiang, Lan; Cao, Qiang; Shi, Xueshong; Wang, Qingsong; Wang, Guoyan; Lu, Yongfeng.

In: Applied Physics A: Materials Science and Processing, Vol. 122, No. 3, 205, 01.03.2016.

Research output: Contribution to journalArticle

@article{c4036b6372fa4d6fab473d7231fd0bbc,
title = "Ultrafast imaging the light-speed propagation of a focused femtosecond laser pulse in air and its ionized electron dynamics and plasma-induced pulse reshaping",
abstract = "The light-speed propagation of a focused femtosecond (fs) laser pulse in air was recorded by a pump–probe shadowgraph imaging technique with femtosecond time resolution. The ultrafast dynamics of the laser-ionized electrons were studied, which revealed a strong reshaping of the laser field due to laser–air nonlinear interaction. The influence of laser fluence and focusing conditions on the pulse reshaping was studied, and it was found that: (1) double foci are formed due to the refocusing effect when the laser fluence is higher than 500 J/cm2 and the focusing numeric aperture (NA) is higher than 0.30; and (2) a higher NA focusing lens can better inhibit the prefocusing effect and nonlinear distortion in the Gaussian beam waist.",
author = "Yanwu Yu and Lan Jiang and Qiang Cao and Xueshong Shi and Qingsong Wang and Guoyan Wang and Yongfeng Lu",
year = "2016",
month = "3",
day = "1",
doi = "10.1007/s00339-016-9773-8",
language = "English (US)",
volume = "122",
journal = "Applied Physics A: Materials Science and Processing",
issn = "0947-8396",
number = "3",

}

TY - JOUR

T1 - Ultrafast imaging the light-speed propagation of a focused femtosecond laser pulse in air and its ionized electron dynamics and plasma-induced pulse reshaping

AU - Yu, Yanwu

AU - Jiang, Lan

AU - Cao, Qiang

AU - Shi, Xueshong

AU - Wang, Qingsong

AU - Wang, Guoyan

AU - Lu, Yongfeng

PY - 2016/3/1

Y1 - 2016/3/1

N2 - The light-speed propagation of a focused femtosecond (fs) laser pulse in air was recorded by a pump–probe shadowgraph imaging technique with femtosecond time resolution. The ultrafast dynamics of the laser-ionized electrons were studied, which revealed a strong reshaping of the laser field due to laser–air nonlinear interaction. The influence of laser fluence and focusing conditions on the pulse reshaping was studied, and it was found that: (1) double foci are formed due to the refocusing effect when the laser fluence is higher than 500 J/cm2 and the focusing numeric aperture (NA) is higher than 0.30; and (2) a higher NA focusing lens can better inhibit the prefocusing effect and nonlinear distortion in the Gaussian beam waist.

AB - The light-speed propagation of a focused femtosecond (fs) laser pulse in air was recorded by a pump–probe shadowgraph imaging technique with femtosecond time resolution. The ultrafast dynamics of the laser-ionized electrons were studied, which revealed a strong reshaping of the laser field due to laser–air nonlinear interaction. The influence of laser fluence and focusing conditions on the pulse reshaping was studied, and it was found that: (1) double foci are formed due to the refocusing effect when the laser fluence is higher than 500 J/cm2 and the focusing numeric aperture (NA) is higher than 0.30; and (2) a higher NA focusing lens can better inhibit the prefocusing effect and nonlinear distortion in the Gaussian beam waist.

UR - http://www.scopus.com/inward/record.url?scp=84960977966&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84960977966&partnerID=8YFLogxK

U2 - 10.1007/s00339-016-9773-8

DO - 10.1007/s00339-016-9773-8

M3 - Article

AN - SCOPUS:84960977966

VL - 122

JO - Applied Physics A: Materials Science and Processing

JF - Applied Physics A: Materials Science and Processing

SN - 0947-8396

IS - 3

M1 - 205

ER -