Fig. 1. Working schematic of laser marking equipment

Fig. 2. Macroscopic displays on surface of 5052 anodic aluminum oxide alloy after laser surface processing with different setup powers. (a) 23%P0; (b) 25%P0; (c) 27%P0; (d) 33%P0; (e) 38%P0; (f) 40%P0; (g) 50%P0

Fig. 3. Laser output power as a function of pattern contrast

Fig. 4. Micro-morphologies on surface of 5052 anodic aluminum oxide alloy after laser surface processing with different setup powers. (a) 1.64 W; (b) 1.88 W; (c) 2.13 W; (d) 2.76 W; (e) 3.32 W; (f) 3.58 W; (g) 4.66 W

Fig. 5. SEM micro-morphologies of aluminum surface before and after laser surface processing. (a) 500×; (b) local amplification for 5000×

Fig. 6. SEM micro-morphologies of aluminum cross section. (a) Before laser surface processing; (b) after laser surface processing

Fig. 7. SEM micro-morphologies of aluminum surface before and after laser surface processing with setup power of 38%P0