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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
Interactive dynamics of two copropagating laser beams in underdense plasmas
Hui-Chun Wu1, Zheng-Ming Sheng, Jie Zhang
1Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Science, Beijing 100080, China.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 28, 2004
Summary
Investigating two laser beams in plasma reveals complex interactions. Relativistic effects cause attraction, while ponderomotive forces can attract or repel, influencing self-focusing and beam channeling.
Area of Science:
- Plasma Physics
- Nonlinear Optics
- Laser-Plasma Interactions
Background:
- Understanding laser beam propagation in plasmas is crucial for inertial confinement fusion and high-intensity laser applications.
- The interplay of relativistic and ponderomotive effects governs beam dynamics in underdense plasmas.
Purpose of the Study:
- To analytically and numerically investigate the interaction of two copropagating laser beams with crossed polarization in underdense plasmas.
- To elucidate the roles of relativistic mass correction and ponderomotive force in beam interaction and self-focusing.
Main Methods:
- Analytical investigation using the variational approach.
- Numerical simulations based on coupled envelope equations.
- Inclusion of relativistic mass correction and ponderomotive force effects.
Main Results:
- Relativistic effects consistently induce beam attraction.
- Ponderomotive forces exhibit dual behavior (attraction/repulsion) dependent on beam parameters.
- Observed transverse oscillations of beam centers, with ponderomotive forces increasing oscillation frequency.
- Interaction between beams lowers the self-focusing threshold power.
- Demonstrated channeling of a weak beam by a strong self-trapping beam.
Conclusions:
- The combined relativistic and ponderomotive effects lead to complex beam dynamics, including attraction, repulsion, and oscillation.
- Laser beam interaction significantly modifies self-focusing thresholds and enables beam channeling phenomena.
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