Weakly relativistic and ponderomotive effects in interaction of intense laser beam with inhomogeneous collisionless and collisional plasmas

Influence of plasma inhomogeneity and ohmic heating on the nonlinear absorption of intense laser pulse in collisional magnetized plasma

“…The z > 0 region is taken to be filled with an inhomogeneous non-isothermal plasma with a plasma-vacuum interface at z = 0. The initial density of plasma can be considered as [16,28,29]…”

“…The $$$ z>0 $$$ region is taken to be filled with an inhomogeneous non‐isothermal plasma with a plasma‐vacuum interface at $$$ z=0 $$$. The initial density of plasma can be considered as [ 16,28,29 ] $$$$ {n}_{e0}(z)={n}_0+\left({n}_{\mathrm{cr}}-{n}_0\right)\frac{z}{\sigma_1}, $$$$ where $$$ {n}_0 $$$ is the electron density at $$$ z=0 $$$, $$$ {n}_{cr} $$$ is the critical density which is equal to $$$ {m}_e{\varepsilon}_0{\omega}^2/{e}^2 $$$ and $$$ {\sigma}_1 $$$ is a constant which indicates the slope of the density ramp. On the other hand, the inhomogeneity of the plasma temperature is [ 30,31 ] $$$$ {T}_{e,i}(z)={T}_{e0}\left(1+\frac{z}{\sigma_2}\right), $$$$ where $$$ {T}_{e0} $$$…”

Variable density formation by intense microwave beams near the critical density

“…[26,27] Choosing the linear polarization of the electric and magnetic fields and supposing the z dependence of these quantities, we have In obtaining the above equation, we assumed that the time-dependent of the electromagnetic fields is exp(−i t).…”

Nonlinear structure of electromagnetic field, electron temperature and electron density in interaction of relativistic laser and plasma with density ripple

“…Abedi et al (2011), and have analyzed nonlinear heating and relativistic effect on the nonlinear structure of laser and plasma in collisional underdense plasma. Recently, Niknam et al (2009;2014) have studied weakly relativistic and ponderomotive effects on the density steepening in the interaction of an intense laser pulse with an underdense plasma. Panwar et al (2013) have investigated the effect of plasma channel nonuniformity on resonant third harmonic generation, and found that density ripple would affect harmonic generation.…”

“…In papers based on our previous investigation (Xia & Xu, 2013) and Niknam et al (2009;2014), we investigated the influence of relativistic, ohmic heating, and plasma ripple on electromagnetic field, electron temperature and electron density in interaction of relativistic laser and plasma with density ripple. The previous lots research works of nonlinear effects mainly focus on homogeneous plasma, while the nonlinear structure of electromagnetic wave and plasma has received relatively less attention in relativistic laser and inhomogeneous plasma interaction.…”