Fig. 1. Schematics of computational domain and mesh. (a) Verification model; (b) computational model

Fig. 2. Pressure distribution at different grid sizes on y=0 at 10 μs

Fig. 3. Comparison of numerical simulated and experimental results of LIP evolution process when single pulse laser energy is 50 mJ. (a) Numerical schlieren diagram; (b) experimental schlieren diagram^[28]

Fig. 4. Numerical schlieren diagrams of multi-point LIP when focal layout is line

Fig. 5. 2500 K temperature isosurface diagrams of multi-point LIP when focal layout is line

Fig. 6. Pressure distribution at different time in x direction (y=0, z=0) when focal layout is line

Fig. 7. Temperature distribution at different time in x direction (y=0, z=0) when focal layout is line

Fig. 8. Schematics of different focal layouts. (a) Line;

Fig. 9. Numerical schlieren diagrams of multi-point LIP with different focal layouts. (a) Line; (b) square; (c) regular triangle

Fig. 10. 2500 K temperature isosurface diagrams of multi-point LIP with different focal layouts. (a) Line; (b) square; (c) regular triangle

Fig. 11. Diagram of average temperature and volume changes of plasma kernel produced by multi-point LIP with different focal layouts

Fig. 12. Variation diagram of specific surface area of plasma kernel produced by multi-point LIP with different focal layouts

Fig. 13. Pressure distribution in x direction (y=0,z=0) with different focal layouts at 10 μs

Fig. 14. 2500 K temperature isosurface diagrams of multi-point LIP with different distances between two adjacent laser focal spots.

Fig. 15. Diagram of average temperature (left axis) and volume (right axis) changes of plasma kernel produced by multi-point LIP with different distance between two adjacent laser focal spots

Fig. 16. Variation diagram of specific surface area of plasma kernel produced by multi-point LIP with different distances between two adjacent laser focal spots

Fig. 17. Pressure distribution of flow field in x direction (y=0, z=0) with different distances between two adjacent laser focal spots at 5 μs and 10 μs