Fig. 1. Schematic illustration of laser beam smoothed by ISI and DLA in a cylindrical hohlraum

Fig. 2. Beam configuration at one entrance of hohlraum

Fig. 3. Intensity distributions of laser quad at laser entrance hole (LEH) with different incident angles. (a) 23.5°；(b) 30°；(c) 44.5°；(d) 50°

Fig. 4. Intensity distributions of laser quad on hohlraum wall with different incident angles. (a)(d) ISI＋DLA scheme；(e)(h) CPP＋SSD scheme

Fig. 5. One-dimensional intensity distribution of each transmitted sub-beam of DLA on the target plane when Δ＝3 mm

Fig. 6. Laser field distribution of laser quad on hohlraum wall

Fig. 7. Intensity distributions of laser quad on the hohlraum wall with different focal lengths of principal lens. (a) f＝1.575 m; (b) f＝4 m; (c) f＝7.7 m

Fig. 8. FOPAI and PSD curves of laser spots on hohlraum wall with different focal lengths of principal lens. (a) FOPAI curves; (b) PSD curves

Fig. 9. Intensity distributions of laser quads on hohlraum wall with different sub-lens numbers. (a) 6×6; (b) 5×5; (c) 4×4; (d) 3×3

Fig. 10. FOPAI and PSD curves of laser spots on hohlraum wall with different sub-lens numbers. (a) FOPAI curves; (b) PSD curves

Fig. 11. Intensity distribution of laser quad on hohlraum wall with different sub-lens long and short axes ratios

Fig. 12. Laser field distribution of laser quads on hohlraum wall after adjustment of the number of DLA sub-lens and the focal length of principal lens

Fig. 13. Laser field distribution of inner laser quad on hohlraum wall after adjusting incident angle of inner laser quads

Fig. 14. Laser field distribution of outer laser quad on hohlraum wall after optimizing sub-lens long and short axes ratio of outer laser quads