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Plasma formation in fused silica induced by loosely focused femtosecond laser pulse

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3 Author(s)
Wu, Alexander Q. ; School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907 ; Chowdhury, Ihtesham H. ; Xianfan Xu

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The focusing position inside fused silica irradiated by a loosely focused high power femtosecond laser pulse is studied both experimentally and numerically. The experimental measurement of plasma radiation shows that the laser pulse is focused behind the focal plane, which is also found in the numerical calculation and is attributed to a complex interplay between self-focusing due to the Kerr effect and defocusing because of the free electron plasma. Also, when more than one pulse is incident at the same spot in the sample, plasma radiation is observed at more than one spot along the laser propagation direction.

Published in:

Applied Physics Letters  (Volume:88 ,  Issue: 11 )