Journal
OPTICS EXPRESS
Volume 20, Issue 19, Pages 21505-21511Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.021505
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Funding
- National Basic Research Program of China (973 Program) [2011CB013000]
- National Natural Science Foundation of China (NSFC) [90923039, 51025521]
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This study reveals that the periods, ablation areas and orientations of periodic surface structures (ripples) in fused silica can be adjusted by using designed femtosecond (fs) laser pulse trains to control transient localized electron dynamics and corresponding material properties. By increasing the pulse delays from 0 to 100fs, the ripple periods are changed from similar to 550nm to similar to 255nm and the orientation is rotated by 90 degrees. The nearwavelength/subwavelength ripple periods are close to the fundamental/second-harmonic wavelengths in fused silica respectively. The subsequent subpulse of the train significantly impacts free electron distributions generated by the previous subpulse(s), which might influence the formation mechanism of ripples and the surface morphology. (C) 2012 Optical Society of America
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