Fig.1 The sketch of bundle-beam smoothing method[9]

Fig.2 Far field intensity distribution for one beam and for eight beams with coherent superpositions (a) one beam, (b) bundle beam

Fig.3 The plasma status (The laser propagates from right to left. The ne is electron number density. te, ti are temperature of electrons and ions. Uz is the flow velocity along z direction.)

Fig.4 (a)~(c) The time integrated angle distributions for scattering light and (d)~(f) the correlation factors at time 116 ps

Fig.5 The average intensity of incident and scattering lights along the propagation direction

Fig.6 Growth rate for sharing ion acoustic wave of SBS as (a) eight beams incident with same angles, (b) four beams with incident angle 2.3° and four beams with 3.7° (The red squares and black pluses in (b) are for the scattering light direction ray retracing and symmetric position of incident light.)

Fig.7 The time averaged intensities of SBS (a) two incident light polarization directions are parallel, (b) and (c) different polarization component as the incident light polarization directions are perpendicular

Fig.8 Ion acoustic wave angle distributions as (a) the incident light polarization directions are parallel, (b) the incident light polarization directions are perpendicular

Fig.9 The ion acoustic wave angle distribution for eight beam incident case

Fig.10 The growth rates for incident lights with different wavelengths, the incident wavelength difference is (a) 0.3 nm and (b) 0.45 nm.

Fig.11 The growth rate for sharing light, the incident angle is 0, 2.3, 3.7 and part 2.3 and 3.7°.

Fig.12 The angular distribution snapshot for (a) scattering light and (b) ion acoustic wave at time 61 ps