• A comparative study of the ionic keV X-ray line emission from plasma produced by the femtosecond, picosecond and nanosecond duration laser pulses

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      https://www.ias.ac.in/article/fulltext/pram/078/02/0277-0288

    • Keywords

       

      X-ray spectroscopy; laser-produced plasma; ionization equilibrium.

    • Abstract

       

      We report here an experimental study of the ionic keV X-ray line emission from magnesium plasma produced by laser pulses of three widely different pulse durations (FWHM) of 45 fs, 25 ps and 3 ns, at a constant laser fluence of $\sim 1.5 \times 10^4$ J cm-2. It is observed that the X-ray yield of the resonance lines from the higher ionization states such as H- and He-like ions decreases on decreasing the laser pulse duration, even though the peak laser intensities of $3.5 \times 10^{17}$ W cm-2 for the 45 fs pulses and $6.2 \times 10^{14}$ W cm-2 for the 25 ps pulses are much higher than $5 \times 10^{12}$ W cm-2 for the 3 ns laser pulse. The results were explained in terms of the ionization equilibrium time for different ionization states in the heated plasma. The study can be useful to make optimum choice of the laser pulse duration to produce short pulse intense X-ray line emission from the plasma and to get the knowledge of the degree of ionization in the plasma.

    • Author Affiliations

       

      V Arora1 P A Naik1 B S Rao1 P D Gupta1

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

       
  • Pramana – Journal of Physics | News

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