Morphology of femtosecond-laser-ablated borosilicate glass surfaces

Ben-Yakar, Adela; Byer, Robert L.; Harkin, Anthony; Ashmore, Jacqueline; Stone, Howard A.; Shen, Mengyan; Mazur, Eric
October 2003
Applied Physics Letters;10/13/2003, Vol. 83 Issue 15, p3030
Academic Journal
We study the morphology of borosilicate glass surface machined by femtosecond laser pulses. Our observations show that a thin rim is formed around ablated craters after a single laser pulse. When multiple laser pulses are overlapped, the crater rims also overlap and produce a surface roughness. The rim appears to be a resolidified splash from a molten layer generated during the ablation process. We estimate that this molten layer is a few micrometers thick and exists for a few microseconds. During this melt lifetime, forces acting on the molten layer move it from the center to the edge of the crater. © 2003 American Institute of Physics.


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