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High-quality high-order harmonic generation through preplasma truncation.

B Y Li1,2, F Liu1,2, M Chen1,2

  • 1Key Laboratory for Laser Plasmas (MoE), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.

Physical Review. E
|December 25, 2019
PubMed
Summary
This summary is machine-generated.

Introducing preplasma truncation enhances high-order harmonic generation efficiency and beam quality in laser-solid interactions. This method reduces dependence on laser pulse contrast, simplifying experimental requirements.

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Area of Science:

  • Plasma Physics
  • Nonlinear Optics
  • Laser-Matter Interactions

Background:

  • High-order harmonic generation (HHG) is crucial for ultrafast science.
  • Relativistic laser-solid interactions present challenges in controlling harmonic emission.
  • Initial preplasma scale length significantly impacts HHG efficiency and beam quality.

Purpose of the Study:

  • To investigate the effect of preplasma truncation on HHG from relativistic laser-solid interactions.
  • To enhance the efficiency and beam quality of generated high-order harmonics.
  • To reduce the stringent requirements on the temporal contrast of driving laser pulses.

Main Methods:

  • Numerical simulations of relativistic laser-solid interactions.
  • Introduction of preplasma truncation for laser pulses with initial preplasma scale length > 0.2λ.
  • Analysis of surface electron sheet oscillation and reflection surface curvature.

Main Results:

  • Preplasma truncation enhances HHG efficiency by over an order of magnitude.
  • Angular spread of harmonics is confined to near-diffraction-limited divergence.
  • Density truncation leads to more compact electron sheet oscillation and reduced reflection surface curvature, improving harmonic beam quality.
  • Harmonic generation becomes weakly dependent on preplasma scale length.
  • A feasible scheme for preplasma truncation was proposed and numerically demonstrated.

Conclusions:

  • Preplasma truncation is an effective method to significantly improve HHG efficiency and beam quality in relativistic laser-solid interactions.
  • This technique relaxes the demanding requirements on laser pulse temporal contrast.
  • The proposed truncation scheme offers a practical pathway for enhanced HHG in experiments.