Abstract
In this work, we report the progressive formation of first nanoparticles, next fine ripples, and eventually coarse ripples during the irradiation of single-crystal 6H-SiC surfaces with increasing number of femtosecond laser pulses (λ = 515 nm, τ = 250 fs, repetition rate = 100 kHz). At laser fluences greater than the single-pulse ablation threshold, nanoparticles were produced on the surface by the first few pulses over which fine ripple patterns overlapped at increased pulse numbers. As the pulse number was further increased over ten, the surface was gradually transformed into a coarse ripple–covered one. At laser fluence below the threshold, however, only fine ripples were formed nonuniformly.
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This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2011-0029850).
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Kim, S.H., Byun, K.H., Sohn, I.B. et al. Progressive formation of fine and coarse ripples on SiC surface by repeated irradiation of femtosecond laser pulses. Appl. Phys. B 113, 395–402 (2013). https://doi.org/10.1007/s00340-013-5476-4
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DOI: https://doi.org/10.1007/s00340-013-5476-4