• R A Khan

      Articles written in Pramana – Journal of Physics

    • Study of $2\omega$ and $3/2\omega$ harmonics in ultrashort high-intensity laser plasma interaction

      V Arora P A Naik J A Chakera R A Khan P D Gupta

      More Details Abstract Fulltext PDF

      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.

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