Abstract
This study investigates the effects of pulse energy distributions on subwavelength ripple structures (the ablation shapes and subwavelength ripples) using the plasma model with the consideration of laser particle–wave duality. In the case studies, the laser pulse (800 nm, 50 fs) trains consist of double pulses within a train with the energy ratios of 1:2, 1:1, and 2:1. Localized transient electron densities, material optical properties, and surface plasmon generation are strongly affected by the energy distributions. Hence, the adjustment of the ablation shape and subwavelength ripples can be achieved based on localized transient electron dynamics control during femtosecond laser pulse train processing of dielectrics. The simulation results show that better, more uniform structures, in terms of ablation shapes and subwavelength ripples, can be easily formed at a lower fluence or subpulse energy ratio of 1:1 with a fixed fluence. It is also found that pulse trains at a 1:1 energy ratio are preferred for drilling high-aspect-ratio microholes or microchannels.
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This research is supported by the National Basic Research Program of China (973 Program) (Grant No. 2011CB013000) and the National Natural Science Foundation of China (NSFC) (Grant Nos. 90923039 and 51025521).
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Yuan, Y., Jiang, L., Li, X. et al. Simulation of rippled structure adjustments based on localized transient electron dynamics control by femtosecond laser pulse trains. Appl. Phys. A 111, 813–819 (2013). https://doi.org/10.1007/s00339-013-7628-0
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DOI: https://doi.org/10.1007/s00339-013-7628-0