• Chinese Optics Letters
  • Vol. 20, Issue 9, 093201 (2022)
Hengyi Zheng1、2, Fukang Yin1、2, Tie-Jun Wang1、2、*, Yaoxiang Liu1, Yingxia Wei1, Bin Zhu3, Kainan Zhou3, and Yuxin Leng1、2
Author Affiliations
  • 1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser Science, Chinese Academy of Sciences, Shanghai 201800, China
  • 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Laser Fusion Research Center and Science & Technology on Plasma Physics Laboratory, China Academy of Engineering Physics, Mianyang 621999, China
  • show less
    DOI: 10.3788/COL202220.093201 Cite this Article
    Hengyi Zheng, Fukang Yin, Tie-Jun Wang, Yaoxiang Liu, Yingxia Wei, Bin Zhu, Kainan Zhou, Yuxin Leng. Time-resolved measurements of electron density and plasma diameter of 1 kHz femtosecond laser filament in air[J]. Chinese Optics Letters, 2022, 20(9): 093201 Copy Citation Text show less

    Abstract

    The temporal evolutions of electron density and plasma diameter of 1 kHz femtosecond laser filament in air are experimentally investigated by utilizing a pump-probe longitudinal diffraction method. A model based on scalar diffraction theory is proposed to extract the spatial phase shift of the probe pulse from the diffraction patterns by the laser air plasma channel. The hydrodynamic effect on plasma evolution at 1 kHz filament is included and analyzed. The measured initial peak electron density of 1018 cm-3 in our experimental conditions decays rapidly by nearly two orders of magnitude within 200 ps. Moreover, the plasma channel size rises from 90 µm to 120 µm as the delay time increases. The experimental observation is in agreement with numerical simulation results by solving the rate equations of the charged particles.
    U2(x,y)=ejkzjλzU1(ξ,η)exp{jk2z[(xξ)2+(yη)2]}dξdη.

    View in Article

    n=(1ωp2ω2)12=(1nenc)121ne2nc,

    View in Article

    nc=ω2meε0/e2.

    View in Article

    ne(r)=ne0exp(r2/w2),

    View in Article

    φfil=ne(r)2nckΔd,

    View in Article

    φKerr=2n2kΔd×I0exp(r2/rp2),

    View in Article

    Ul(r)=Ul(r)exp(jk2fr2),

    View in Article

    net=αneηne+βepnenp,npt=αneβepnenpβnpnnnp,nnt=ηneβnpnnnp,

    View in Article

    β1(m3/s)=2.035×1012Te0.39(eN2+),β2(m3/s)=1.138×1011Te0.70(eO2+),βep=0.79β1+0.21β2,

    View in Article

    Hengyi Zheng, Fukang Yin, Tie-Jun Wang, Yaoxiang Liu, Yingxia Wei, Bin Zhu, Kainan Zhou, Yuxin Leng. Time-resolved measurements of electron density and plasma diameter of 1 kHz femtosecond laser filament in air[J]. Chinese Optics Letters, 2022, 20(9): 093201
    Download Citation