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Harmonic Generation in Molecular Ag2S Plasma.

Rashid A Ganeev1,2

  • 1Institute of Fundamental and Applied Research, TIIAME National Research University, Kori Niyoziy 39, Tashkent 100000, Uzbekistan.

International Journal of Molecular Sciences
|August 10, 2024
PubMed
Summary

Silver sulfide (Ag₂S) molecular laser-induced plasma (LIP) significantly enhances high-order harmonic generation in the extreme ultraviolet (XUV) range. This molecular plasma produced 4-10 times stronger XUV harmonics than atomic silver plasma.

Keywords:
Ag2Shigh-order harmonic generationlaser-induced ablationmolecular plasma

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Area of Science:

  • Atomic and Molecular Physics
  • Plasma Physics
  • Nonlinear Optics

Background:

  • High-order harmonic generation (HHG) is a crucial process for producing extreme ultraviolet (XUV) radiation.
  • Laser-induced plasma (LIP) offers a versatile medium for HHG, with its properties influencing conversion efficiency.
  • Molecular plasmas present unique characteristics compared to atomic plasmas for nonlinear optical phenomena.

Purpose of the Study:

  • To investigate the potential of molecular laser-induced plasma (LIP) from silver sulfide (Ag₂S) for high-order harmonic generation (HHG).
  • To analyze the influence of plasma properties and driving laser parameters on harmonic conversion efficiency in Ag₂S LIP.
  • To compare the HHG performance of Ag₂S molecular plasma with atomic metal LIPs.

Main Methods:

  • Ablation of silver sulfide (Ag₂S) to generate molecular laser-induced plasma (LIP).
  • Generation and characterization of high-order harmonics in the extreme ultraviolet (XUV) range using the Ag₂S LIP.
  • Systematic variation of driving laser pulse properties (chirp, single-color, two-color, pulse delay) to optimize harmonic yield.
  • Comparative analysis of harmonic generation in Ag₂S LIP versus atomic silver (Ag) and other metal LIPs.

Main Results:

  • Molecular Ag₂S LIP was successfully utilized as a medium for high-order harmonic generation in the XUV range.
  • Harmonic conversion efficiency was found to be dependent on LIP formation, plasma composition, and geometry.
  • Driving pulse parameters, including chirp and two-color pumping, significantly influenced the harmonic yield.
  • Ag₂S molecular plasma exhibited 4 to 10 times stronger harmonic generation compared to atomic Ag LIP.
  • Harmonics up to the 59th order were achieved under optimized conditions for the molecular plasma.

Conclusions:

  • Molecular laser-induced plasma from Ag₂S is a highly efficient medium for generating strong high-order harmonics in the XUV region.
  • The molecular nature of the plasma and specific driving laser configurations play a critical role in enhancing HHG efficiency.
  • Ag₂S molecular LIP offers a promising alternative to atomic plasmas for advanced XUV light sources.