Fig. 1. Femtosecond laser ablation mechanism of gear material

Fig. 2. Energy distribution of Gaussian beam

Fig. 3. Temperature field change of electron and lattice system

Fig. 4. Three-dimensional distribution of temperature field in lattice system

Fig. 5. Femtosecond laser micromachining system

Fig. 6. Characteristics of ablative ring morphology at different energy densities

Fig. 7. Micro morphology of ablation pit at different energy densities

Fig. 8. Full view, wall and bottom topography of ablation pit

Fig. 9. Ablative pit depths at different energy densities

Fig. 10. Surface roughness at different energy densities