Fig. 1. Ultrafast beam smoothing scheme based on rotation arrangement of phase plates

Fig. 2. Dynamic interference patterns on focal plane after rotation of different phase plates

Fig. 3. Focal spot light intensity distributions by different smoothing schemes. (a) 2D-SSD ＋ CPP; (b) PPR＋ CPP; (c) 2D-SSD ＋ PPR ＋ CPP

Fig. 4. Influences of parameters of phase plate on beam smoothing effect. (a) Contrast of every type of phase plate array versus PV value of phase plate; smoothing effects of (b) off-axis ellipsoidal phase plate and (c) off-axis spiral phase plate versus deviation under different PV values; (d) power in bucket of off-axis ellipsoidal phase plate

Fig. 5. Contrasts of every type of phase plate array under different arrangement patterns. (a) Tilted phase plate; (b) off-axis ellipsoidal phase plate; (c) off-axis spiral phase plate

Fig. 6. Influence of phase distortion of laser beam on beam smoothing effect. (a) Contrast versus PV value of wavefront phase distortion(integration time of 10 ps); (b) contrast versus time under different phase distortion PV values of phase distortion; (c) power in bucket

Fig. 7. Beam smoothing effects of different schemes. (a) Contrast curves; (b) FOPAI curves

Fig. 8. Influences of spatial deviation on beam smoothing effect. (a) Influence of spatial deviation on beam smoothing effect for laser beam incident on phase element; (b) influence of coincidence degree of sub-beam focal spots on beam smoothing effect