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Transparency of an overdense plasma layer.

¹Shanghai Institute of Optics and Fine Mechanics, P. O. Box 800-211, Shanghai 201800, China.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|December 12, 2001

Summary

High-intensity laser pulses transition between opaque and transparent states in plasma layers. Opacity depends on electron density, laser intensity, and plasma layer thickness, influencing ion acceleration.

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Area of Science:

Plasma physics
Laser-plasma interactions
High-intensity physics

Background:

Understanding laser propagation through plasma is crucial for applications like inertial confinement fusion and particle acceleration.
Overdense plasma layers present a significant challenge due to their opacity to electromagnetic radiation.

Purpose of the Study:

To investigate the transition from opacity to transparency of overdense plasma layers for high-intensity laser pulses.
To identify the key parameters governing this transition and their impact on ion acceleration.

Main Methods:

Theoretical analysis of plasma layer opacity and transparency.
Numerical simulations of laser-plasma interactions.
Investigation of stationary solutions and their stability.

Main Results:

Opacity is found to depend on electron density, laser intensity, and plasma layer thickness.
A region of overlap exists where both transparency and opacity are possible, influenced by the system's history.
Ion acceleration is studied in both opaque and transparent plasma regimes.

Conclusions:

The opacity of overdense plasma layers to high-intensity laser pulses is a complex phenomenon dependent on multiple parameters.
The identified regimes and their dependence on history provide insights into controlling laser-plasma interactions.
Understanding these transitions is vital for optimizing laser-driven ion acceleration techniques.

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