A new method oflaser ablation, having high pulse-rate of the order of MHz, with short ps and sub-ps pulses, has been recently developed at the ANU. As a preliminary test for the short-pulse ablation applied to art conservation for selective removal of unwanted surface layers, we used the ps laser to clean brass samples coated with contaminant layers such as rust, paint and wax. We demonstrated the laser cleaning system with 2nd (λ2=532nm) and 4th (λ4=266nm) harmonics of a Nd: YVO4 ultra-fast laser, combined with a constantvelocity scanning system. Great flexibility in cleaning the surfaces selectively was demonstrated by removal of the wax coating from the black-painted surface without altering the black paint surface sub-structure. Major conservation and restoration challenges were considered where ultrafast laser cleaning might playa vital role.
|Title of host publication||Laser Cleaning II|
|Place of Publication||United States|
|Publisher||World Scientific Publishing Co.|
|Number of pages||12|
|Publication status||Published - 1 Jan 2007|