Sonu Sen
Recent advances in laser technology, based on the chirped pulse amplification technique, make intensities greater than 1018 W/cm2 available for experiments. In these experiments the laser beam power can be thousand times larger than the critical value. At such intensities, the physics of the laser-plasma interaction is very different from the well-studied case of more moderate intensities. In the present work we make an analytical investigation of nonlinear propagation of intense laser pulse through inhomogeneous plasma with relativistic ponderomotive nonlinearity. The relativistic oscillations of the electron mass in the field of intense laser beam effects the dynamics of propagation in plasma. An appropriate expression for the nonlinear dielectric constant has been used in the analysis of laser-beam propagation with in WKB and paraxial approximation. A differential equation of the beam width parameter with the distance of propagation is derived including the effects of relativistic self-focusing and ponderomotive self-channeling. The focusing properties of the beam are governed by the laser power as well as the laser intensity. An increase in the laser intensity leads to an enhancement of ponderomotive self-channeling and weakening of relativistic self-focusing.
The nature of propagation of an intense laser beam in a plasma depends on the power, width of the beam and ‘W’ the ratio of plasma frequency and laser frequency. Numerical estimates are made for typical values of the laser–plasma interaction process: electron density varying between 10^17-10^20 particles per cm^3 and radiation intensities in the range 10^16-10^20 W/cm^2 are considered for different types of density ramps.
In the present work we make an analytical investigation of nonlinear propagation of intense laser pulse through inhomogeneous plasma with relativistic ponderomotive nonlinearity.A differential equation of the beam width parameter with the distance of propagation is derived including the effects of relativistic self-focusing and ponderomotive self-channeling.
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