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문혜영(Heh-Young Moon),시두 메라 씽(Mehra Singh Sidhu),이현규(Hyun-Kyu Lee),정세채(Sae-Chae Jeoung) 한국레이저가공학회 2011 한국레이저가공학회지 Vol.14 No.4
In this work, we have studied on time-resolved transient reflective image of single crystalline Si surface after single-shot fs-laser irradiation with varying the laser fluence under two different laser spot sizes. The temporal profiles of transient reflectivity changes as well as its maximum values at the early delay time were found to be strongly dependent on both the laser beam spot size and laser fluence. We have interpreted the dependence of transient reflectivity changes on the laser spot size in terms of a relaxation of the generated free carriers to the bulk silicon, which should be interacted with the plasma.