Fig. 1. Experimental setup

Fig. 2. Laser output intensity distribution with pulse width (use FWHM as the pulsed width, normalized at its maximum)

Fig. 3. Image of the target material moving when the laser energy density is 3 969.09 J/cm²

Fig. 4. Image of the target material moving when the laser energy density is 2 496.34 J/cm²

Fig. 5. Image of the target material moving when the laser energy density is 808.41 J/cm²

Fig. 6. Moving speed of the target vapor front with different laser energy densities

Fig. 7. 5x microscopic images of ablation hole with different energy densities

Fig. 8. Image of cracks inside the ablation hole at energy densities of 463.10 J/cm²(10x)

Fig. 9. Depth extended microscopic image of ablation hole at two energy densities (5x)

Fig. 10. Curve of mass loss and specific energy of ablation with energy density