Fig. 5. (IMAGE)
Caption
Fig. 5. Geometry of the dual-color Gaussian drive beam (represented by an electric field Ey proceeding to the right) and the counterpropagating source beam (with an electric
field Ez propagating to the left) just before the interaction at 1TL in (A). Electric field magnitudes are normalized to mc휔L ∕e. The dynamics of the interaction are shown in
(B) to (D), where the single RES is accelerated in the forward direction and reflects a fraction of the source pulse marked by a rectangular box in (D). Panels (F) to (H) depict the
on-axis spatial lineout of the drive pulse (green lines) overlaid with the electron density (gray lines) at y = 0 averaged over 7 adjacent grid cells. The distribution of the single
RES in the transverse direction at 5TL (black line) is demonstrated in (E) overlaid with the normalized transverse profile of the source pulse (light blue shade) and the initial
transverse profile of the drive pulse on target in light green shade. The spatial, temporal, and spectral features of the backscattered source pulse reflected by the single RES
generated by 2-color Gaussian drive beam at simulation time 10TL are depicted in panels (J) to (L), respectively. The temporal profile of the squared field is shown in (K) with
an 180-as duration at its FWHM, and the corresponding modulated spectrum without performing any frequency filtering is shown in (L). Maintaining all of the interaction
parameters, the radial size dependence of the generated single RES on the focal spot of the drive laser is plotted in panel (I). This analysis is performed at the moment 5TL
when the source pulse is supposed to interact with the RES. The green-color-coded dot represents the case in panel (E).
Credit
Ultrafast Science
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