图1 集束激光的束匀滑示意图[9]

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

图2 单子束与集束远场分布(a) 单子束，(b) 8个单子束相干叠加后的集束

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

图3 等离子体初始状态(激光从右端入射(-z方向)，其中ne为电子数密度，单位为临界密度，te, ti为电子和离子温度，单位为keV, Uz为等离子体沿着z方向的流速，单位为光速c。)

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.)

图4 (a)~(c) 散射光的时间积分角分布及(d)~(f) 116 ps时的相关函数

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

图5 入射光和SBS光平均强度沿激光传播方向的变化

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

图6 共用离子声波时SBS增长率(a) 8个子束以相同的入射角入射时，其增长率是相同的，但对应的离子声波的波数有些许移动；(b)当8个子束中的4束以2.3°和另4束以3.7°入射时的增长率，其最大增长率比8子束以相同入射角入射时小((b)中“+”为散射光与入射光关于离子声波传播方向对称，“■”为散射光原路返回的情况。)

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.)

图7 时间平均的SBS近场强度分布(a)单偏振, (b)组合偏振中每个偏振中散射光的角分布(横轴和纵轴坐标单位为k⊥/k0。)

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

图8 离子声波的角分布(a) 两束偏振方向相同的激光入射, (b) 两束偏振垂直的激光入射

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

图9 8个子束入射时产生的离子声波的角分布 (坐标轴单位为k⊥/k0。)

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

图10 两色光入射时SBS增长率(a) 波长差为0.3 nm; (b) 波长差为0.45 nm

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.

图11 偏振方向相同的激光以不同的角度入射时，共用散射光波的增长率相同。入射角度为0，2.3，3.7°及部分子束2.3°和部分子束3.7°。

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

图12 共用散射光波时(a)散射光和(b)离子声波的角分布(时间为61 ps。)

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