Abstract:Aluminum targets were ablated by focusing a KrF excimer laser (248 nm, 40 ns, <1.2 J) down to a spot size of 0.05 cm2 with a fluence of approximately 4.9 J/cm2 [l]. After a few tens of pulses, surface irregularities (corrugations and pits) progressively emerge, with size 1-100 pm which is much larger than the laser wavelength. Such large scale surface roughness causes multiple reflections of the laser light, and may increase the absorption coefficient over a pristine, flat surface by an order of magnitude. Thu… Show more
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