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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/075/06/1175-1179

    • Keywords

       

      Parametric instability; three-halved harmonics; ultrashort laser plasma interaction; pre-pulse parameters.

    • Abstract

       

      An experimental study is presented on measurements of optical spectrum of the laser light scattered from solid surface irradiated by Ti:sapphire laser pulses up to an intensity of $1.2 \times 10^{18}$ W cm-2. The spectrum has well-defined peaks at wavelengths corresponding to $2\omega$ and $3/2\omega$ radiations. The spectral features vary with the laser intensity and show blue-shift with increasing laser intensity. At a constant laser fluence, the spectrum is red-shifted with increasing laser pulse duration. The observed results are explained in terms of the density scale length variation of the plasma and laser chirp.

    • Author Affiliations

       

      V Arora1 P A Naik1 J A Chakera1 R A Khan1 P D Gupta1

      1. Laser Plasma Division, Raja Rammana Centre for Advanced Technology, Indore 452 013, India
    • Dates

       
  • Pramana – Journal of Physics | News

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