Fig. 1. CFRP sample. (a) CFRP sample; (b) surface resin thickness

Fig. 2. Picosecond laser processing system

Fig. 3. Laser ablation experimental scheme. (a) Single laser scanning; (b) picossecond laser scanning strategy

Fig. 4. Carbon fibers recycled after laser decomposition

Fig. 5. Schematic diagram of single filament stretching experiment

Fig. 6. CFRP ablation cross sections at a power of 9 W. (a) 750 mm/s; (b) 700 mm/s; (c) 650 mm/s; (d) 600 mm/s; (e) 550 mm/s; (f) 500 mm/s

Fig. 7. CFRP ablation surfaces at a power of 9 W. (a) 500 mm/s; (b) 550 mm/s; (c) 600 mm/s; (d) 650 mm/s; (e) 700 mm/s; (f) 750 mm/s

Fig. 8. CFRP ablation cross sections at a power of 11 W. (a) 750 mm/s; (b) 700 mm/s; (c) 650 mm/s; (d) 600 mm/s; (e) 550 mm/s

Fig. 9. CFRP ablation surfaces at a power of 11 W. (a) 550 mm/s; (b) 600 mm/s; (c) 650 mm/s; (d) 700 mm/s; (e) 750 mm/s

Fig. 10. CFRP ablation cross sections at a power of 13 W. (a) 800 mm/s; (b) 750 mm/s; (c) 700 mm/s; (d) 650 mm/s; (e) 600 mm/s

Fig. 11. CFRP ablation surfaces at a power of 13 W. (a) 800 mm/s; (b) 750 mm/s; (c) 700 mm/s; (d) 650 mm/s; (e) 600 mm/s

Fig. 12. CFRP ablation cross sections at a power of 15 W. (a) 850 mm/s; (b) 800 mm/s; (c) 750 mm/s; (d)700 mm/s

Fig. 13. CFRP ablation surfaces at a power of 15 W. (a) 850 mm/s; (b) 800 mm/s; (c) 750 mm/s; (d) 700 mm/s

Fig. 14. The optimal speed and process parameter range for ultraviolet picosecond laser recovery

Fig. 15. Morphology of recycled carbon fiber in P9 experimental group. (a) P9S₅₅₀; (b) P9S₆₀₀; (c) P9S₆₅₀; (d) P9S₇₀₀

Fig. 16. AFM surface morphology of recycled carbon fiber in P9 experimental group. (a) VCF; (b) P9S₅₅₀; (c) P9S₆₅₀

Fig. 17. Morphology of recycled carbon fiber in P11 experimental group. (a) P11S₆₀₀; (b) P11S₆₅₀; (c) P11S₇₀₀

Fig. 18. AFM surface morphology of recycled carbon fiber in P11 experimental group. (a) P11S₆₀₀, (c) P11S₆₅₀

Fig. 19. Morphology of recycled carbon fiber in P13 experimental group. (a) P13S₆₅₀; (b) P13S₇₀₀; (c) P13S₇₅₀

Fig. 20. AFM surface morphology of recycled carbon fiber in P13 experimental group. (a) P13S₆₅₀; (b) P13S₇₀₀

Fig. 21. Morphology of recycled carbon fiber in P15 experimental group. (a) P15S₇₅₀; (b) P15S₈₀₀

Fig. 22. AFM surface morphology of recycled carbon fiber in P15 experimental group. (a) P15S₇₅₀; (b) P15S₈₀₀

Fig. 23. Raman spectrogram of recycled carbon fiber by ultraviolet ps laser

Fig. 24. R value of original carbon fiber and ultraviolet ps recycled carbon fiber

Fig. 25. Tensile strength and modulus of recycled fibers under different parameters by ultraviolet ps laser