Fig. 1. Experimental setup

Fig. 2. Variation of spectral line intensity with laser energy

Fig. 3. Relationship between single pulse LIBS with acquisition gate delay. (a) Spectra of single pulse LIBS at different acquisition gate delay; (b) variation of spectral line intensity of single pulse LIBS with acquisition gate delay

Fig. 4. Effect of focus position on spectral line intensity and RSD. (a) Spectral line intensity; (b) RSD

Fig. 5. Cavitation bubble images induced by two wavelengths of laser with different laser energies, taken after expansion for 100 μs. (a) 532 nm; (b) 1064 nm

Fig. 6. Variation of bubble diameter at 100 μs time delay after excitation with different laser energy

Fig. 7. Maximum cavitation bubble images induced by two kinds of lasers under different laser energy. (a) 532 nm; (b) 1064 nm

Fig. 8. Variation of maximum bubble diameter under different laser energy

Fig. 9. Evolution process of cavitation bubbles induced by laser with two wavelengths. (a) 532 nm; (b) 1064 nm

Fig. 10. Variation of cavitation bubble diameter with measurement delay time

Fig. 11. Variation of cavitation bubble diameter with focus position