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정세채,이흥순,시두,문혜영,Jeoung, Sae Chae,Lee, Heung Soon,Sidhu, M.S.,Moon, Heh-Young 한국레이저가공학회 2014 한국레이저가공학회지 Vol.17 No.4
Femtosecond laser induced shock generation in water and vitreous humor of enucleated porcine eyeball was investigated. When focusing the femtosecond laser into the liquid mediums, the acoustic waves with a frequency of about 15.6kHz could be observed by using wide-band microphone. The amplitude of the acoustic signals from water has attained a maximum under a laser power of about 5mW. Further increment of the power results in a decrement of the acoustic signals due to nonlinear optical process including filamentation of laser beam. We have further investigated the effect of femtosecond laser induced acoustic waves by applying the laser pulse into enucleated porcine eyeball. The comparative studies on both healthy and diseased eyeballs led us propose that the femtosecond laser pulses could be utilized as a novel tools for treatment of partially detached retina layers from their choroid structures.
단일 펨토초 레이저펄스를 이용한 실리콘 표면에서의 시분해 반사율 측정 연구
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.