The influence of vacuum polarization effects on the interactions of multiple ultra-intense lasers with plasmas is discussed. The nonlinear paraxial monochromatic model of the interactions has been improved by consider...The influence of vacuum polarization effects on the interactions of multiple ultra-intense lasers with plasmas is discussed. The nonlinear paraxial monochromatic model of the interactions has been improved by considering the Heisenberg–Euler Lagrangian density of two laser processes. Comparing the corrections of vacuum polarization effects in the collision of laser beams with one generated by a single intense laser, we find that the former has a higher order of magnitude correction. The laser collision also produces variations in the propagation direction and polarization direction of the lasers propagating in the plasma. In addition, the strong-field quantum electrodynamic(QED) effects can be enhanced by increasing the laser intensity or frequency difference, or by adjusting the incident angles of the two laser beams.展开更多
Vortex harmonics with fractional average orbital angular momentum are genera ted when a relativistic fractional vortex beam is incident on and reflected from an over-dense plane plasma target. A two-step model is pres...Vortex harmonics with fractional average orbital angular momentum are genera ted when a relativistic fractional vortex beam is incident on and reflected from an over-dense plane plasma target. A two-step model is presented to explain the far-field patterns of the harmonics. In the Erst step, a fundamental spot-shaped hole is produced during the hole-boring stage, and harmonics are genera ted simultaneously. In the second step, differen t oTder harmonics are diffracted by the hole and propagate to the far field. This process can be accurately described by the Fraunhofer diffraction theory. This work facilitates a basic recognition of fractional vortex beams.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 11805117)the Shanghai Leading Academic Discipline Project (Grant No. S30105)。
文摘The influence of vacuum polarization effects on the interactions of multiple ultra-intense lasers with plasmas is discussed. The nonlinear paraxial monochromatic model of the interactions has been improved by considering the Heisenberg–Euler Lagrangian density of two laser processes. Comparing the corrections of vacuum polarization effects in the collision of laser beams with one generated by a single intense laser, we find that the former has a higher order of magnitude correction. The laser collision also produces variations in the propagation direction and polarization direction of the lasers propagating in the plasma. In addition, the strong-field quantum electrodynamic(QED) effects can be enhanced by increasing the laser intensity or frequency difference, or by adjusting the incident angles of the two laser beams.
基金supported by the National Natural Science Foundation of China (Nos. 11575274, 11674339, and 11335013)the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB16)+2 种基金the Ministry of Science and Technology of the People’s Republic of China (Nos. 2016YFA0401102 and 2018YFA0404803)the Innovation Program of Shanghai Municipal Education Commissionthe Shanghai Supercomputer Center for their support
文摘Vortex harmonics with fractional average orbital angular momentum are genera ted when a relativistic fractional vortex beam is incident on and reflected from an over-dense plane plasma target. A two-step model is presented to explain the far-field patterns of the harmonics. In the Erst step, a fundamental spot-shaped hole is produced during the hole-boring stage, and harmonics are genera ted simultaneously. In the second step, differen t oTder harmonics are diffracted by the hole and propagate to the far field. This process can be accurately described by the Fraunhofer diffraction theory. This work facilitates a basic recognition of fractional vortex beams.
