Longitudinal electric field computed at different times in 1D PIC simulation (solid red line) and in fluid simulations (dotted blue line). The transverse electric field is also represented (thin dotted line). Parameters are and , 30 fs duration at FWHM, wavelength , and electron plasma density . The two laser pulses have PPs.
Injected charge vs (all other parameters are kept the same) in 1D PIC simulations. Solid red line with squares: PPs. Dotted blue line with crosses: crossed polarizations.
Result of test particle simulations in vacuum. Comparison between the two heating mechanisms: electron spectra after interaction with the two colliding pulses. Solid red line: PPs; dotted blue line: crossed polarizations. Parameters are Gaussian laser pulses at with duration at FWHM with normalized strength for the pump pulse and for the injection pulse.
Poincaré sections performed for test electrons in vacuum witnessing the collision of two laser pulses. The lasers are assumed to be plane waves and . One can see that chaos appears in the case of crossed polarizations for .
Longitudinal electric field computed at different times in 1D PIC simulation (solid red line) and in fluid simulations (dotted blue line). Parameters are identical to those of Fig. 1 except that the polarizations are crossed.
Experimental setup with two laser beams propagating at angle of 176°.
Raw image from the LANEX screen and its corresponding deconvolved spectra obtained with two parallel polarized laser pulses. Experimental parameters are , , injection position ( corresponds to the center of the gas jet), and density .
Series of 30 consecutive shots with PP. , , injection position , and density .
Top: raw images from the LANEX screen. Bottom: corresponding electron spectra obtained with two laser beams in parallel (solid red line) and crossed (blue dotted line) polarizations with , , injection position , and density .
Injected charge vs (all other parameters are kept the same) in experiments. Solid red line with squares: PPs. Dotted blue line with crosses: crossed polarizations. Each point is an average of three to five shots and the error bars represent the standard deviation.
Article metrics loading...
Full text loading...