| Autor: |
CUI, YU-XIAO, GUO, PING, ZHU, XUEMING, TIAN, YAN-LING, ZHANG, DA-WEI, QI, HOU-JUN |
| Předmět: |
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| Zdroj: |
Surface Review & Letters; Apr2021, Vol. 28 Issue 4, pN.PAG-N.PAG, 7p |
| Abstrakt: |
Femtosecond (fs) laser ablation has been recognized as an effective and promising technique for high-precision processing of natural and synthesized diamond. In this work, a study of femtosecond laser polishing for nanopolycrystalline diamond (NCD) films by chemical vapor deposition (CVD) is reported. The laser irradiation is induced by 200-fs laser pulses with a repetition frequency of 50 MHz, and various laser fluences are employed to investigate their polishing effectiveness. The results show that the optimal laser fluence is 0.7 J/cm2, at which the nanodiamond grains on top of the cauliflower-like clusters of NCD films can be ablated. With such laser fluence, the mean surface roughness of NCD films reduces from 73.84 nm to 31.88 nm, which presents a 57% reduction. Nevertheless, when the laser fluence rises beyond 0.7 J/cm2, large amount of amorphous carbon (a-C) balls and porous lava-like morphology would come into being, resulting in severe degradation of the NCD surface. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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