In this paper, laser cleaning of rust layer on an ancient bronze ware has been performed experimentally using picosecond (ps) and nanosecond (ns) laser pulses. Regarding the surface roughness after laser cleaning, optimal cleaning parameters using ps lasers have been obtained. The comparison on the roughness of the cleaned areas after irradiation of ps and ns laser pulses with the same parameters demonstrates the advantages and effectiveness of ps laser cleaning of bronze ware.
In order to remove the black pollution crusts on the marble artifacts, picosecond (ps) laser cleaning of marble samples has been performed experimentally at three different wavelengths (1064 nm, 532 nm, and 355 nm). Ablation threshold and cleaning efficiency of the three wavelength lasers have been characterized by measuring monolayer ablation depth with 3D microscope using the blow-off model. It has been found that laser ablation efficiency at 1064 nm wavelength is the highest among the above three wavelengths, while that of 355 nm wavelength is the lowest. The ablation threshold of 1064 nm, 532 nm, and 355 nm laser pulses are 0.198±0.033 J/cm2, 0.573±0.114 J/cm2 and 0.739±0.249 J/cm2 respectively. The advantages and effectiveness of ps laser cleaning have been demonstrated in removing contaminants on the marble samples at three different wavelengths, especially at 1064 nm.
Laser cleaning of manmade contaminants from stone samples have been performed experimentally using picosecond (ps) and nanosecond (ns) laser pulses. Regarding the surface roughness after laser cleaning, optimal cleaning parameters using ps laser have been obtained. Discoloration effect induced by ns laser cleaning of stone sample is improved with the usage of ps laser. The comparison on the roughness and elemental analysis of the cleaned area in the experiment also demonstrates the advantages and effectiveness of ps laser cleaning of stone samples.
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