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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
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Electro-optic shocks from ultraintense laser-plasma interactions.

D F Gordon1, B Hafizi, D Kaganovich

  • 1Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375, USA.

Physical Review Letters
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

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Second harmonic radiation is generated as an electro-optic shock in laser wakefield plasma. This shock, driven by laser-electron interactions, grows with interaction length, with emission angle determined by phase velocities.

Area of Science:

  • Plasma Physics
  • Nonlinear Optics
  • Laser-Plasma Interactions

Background:

  • Laser wakefield acceleration is a key area in plasma physics.
  • Understanding radiation generation mechanisms is crucial for advanced applications.

Purpose of the Study:

  • Investigate the production of second harmonic radiation as an electro-optic shock.
  • Analyze the formation and characteristics of this shock in the blowout regime.

Main Methods:

  • Theoretical analysis of laser-plasma interactions.
  • Three-dimensional particle-in-cell (PIC) simulations.
  • Investigation of electron sheath dynamics and radiation generation.

Main Results:

  • Second harmonic radiation is produced as an electro-optic shock.

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  • Shock formation is driven by laser field interaction with the electron sheath.
  • Radiated energy exhibits secular growth with interaction length.
  • Emission angle is determined by the Cherenkov condition based on phase velocities.

    • Conclusions:

    • The study elucidates a novel mechanism for second harmonic generation in laser-produced plasmas.
    • The findings are relevant for understanding high-intensity laser-matter interactions and radiation phenomena.