Damage caused caused by a nanosecond UV laser on a heated copper surface

摘要

This work studied the effect of thin copper plate temperature on its surface morphology after irradiation using a pulsed nanosecond UV laser. The surface characteristics were investigated using scanning electron microscopy, energy dispersive X-ray spectroscopy, focused ion beam and stylus profilometry. When a target was at room temperature, a crater and the radial flow of molten Cu from the crater was observed. When the thin target was warm (about 360 degrees C +/- 20 degrees C), a crater was smaller, and quasi -semicircular waves with the periodicity of around 3 pin appeared in its vicinity. The origin of the waves is Marangoni effect, causing thermocapillary waves, which in same occasions had a structure of final states of chaos in Rayleigh-Benard convection. (C) 2016 Elsevier B.V. All rights reserved.