Laser-Induced Graphitisation of Diamond Under 30 fs Laser Pulse Irradiation
Abstract
The degree of laser-induced graphitisation from a sp3-bonded to a sp2-bonded carbon fraction in a single crystal chemical vapour deposited (CVD) diamond under a varying fluence of an ultrashort pulsed laser (30 fs, 800 nm, 1 kHz) irradiation has been studied. The tetrahedral CVD sp3-phase was found to transition to primarily an sp2-aromatic crystalline graphitic fraction below the critical fluence of 3.9 J/cm2, above which predominantly an amorphous carbon was formed. A fractional increase of fluence from 3.3 J/cm2 to 3.9 J/cm2 (~ 20 %) resulted in a substantial (~ three-fold) increased depth of the sp2-graphitised areas owing to the non-linear interactions associated with an fs-laser irradiation. Additionally, formation of C=O carbonyl group was observed below the critical threshold fluence; the C=O cleavage occurred gradually with the increase of irradiation fluence of 30 fs laser light. The implications for these findings on enhancement of fs-driven processing of diamond are discussed.
Keywords
Cite
@article{arxiv.2203.15505,
title = {Laser-Induced Graphitisation of Diamond Under 30 fs Laser Pulse Irradiation},
author = {Bakhtiar Ali and Han Xu and Dashavir Chetty and Robert T. Sang and Igor V. Litvinyuk and Maksym Rybachuk},
journal= {arXiv preprint arXiv:2203.15505},
year = {2022}
}
Comments
21 pages, 4 figures