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Laser-Induced Graphitization of Diamond Under 30 fs Laser Pulse Irradiation
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2022-03-18 , DOI: 10.1021/acs.jpclett.2c00429 Bakhtiar Ali 1, 2 , Han Xu 2, 3 , Dashavir Chetty 2, 3 , Robert T Sang 2, 3 , Igor V Litvinyuk 2, 3 , Maksym Rybachuk 1, 2
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2022-03-18 , DOI: 10.1021/acs.jpclett.2c00429 Bakhtiar Ali 1, 2 , Han Xu 2, 3 , Dashavir Chetty 2, 3 , Robert T Sang 2, 3 , Igor V Litvinyuk 2, 3 , Maksym Rybachuk 1, 2
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The degree of laser-induced graphitization from a sp3-bonded to a sp2-bonded carbon fraction in a single crystal chemical vapor deposited (CVD) diamond under varying fluence of an ultrashort pulsed laser (30 fs, 800 nm, 1 kHz) irradiation has been studied. The tetrahedral CVD sp3 phase is 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 is formed. A fractional increase of fluence from 3.3 to 3.9 J/cm2 (∼20%) results in a substantially (∼3-fold) increased depth of the sp2 graphitized areas owing to the nonlinear interactions associated with a fs laser irradiation. Additionally, formation of a C═O carbonyl group is observed below the critical threshold fluence; the C═O cleavage occurrs gradually with the increase of irradiation fluence of 30 fs laser light. The implications for these findings on enhancement of fs driven processing of diamonds are discussed.
中文翻译：
30 fs 激光脉冲照射下金刚石的激光诱导石墨化
在超短脉冲激光（30 fs，800 nm，1 kHz）的不同能量密度下，单晶化学气相沉积 (CVD) 金刚石中从 sp 3键合到 sp 2键合碳部分的激光诱导石墨化程度辐照已被研究。发现四面体 CVD sp 3相在低于 3.9 J/cm 2的临界注量下主要转变为 sp 2芳族结晶石墨部分，在该临界注量之上主要形成无定形碳。能量密度从 3.3 到 3.9 J/cm 2 (~20%) 的分数增加导致 sp 2的深度显着增加（~3 倍）由于与飞秒激光照射相关的非线性相互作用，石墨化区域。此外，在临界阈值注量以下观察到 C=O 羰基的形成；随着30 fs激光辐照能量密度的增加，C=O解理逐渐发生。讨论了这些发现对增强 fs 驱动的钻石加工的影响。
更新日期：2022-03-18
中文翻译：
30 fs 激光脉冲照射下金刚石的激光诱导石墨化
在超短脉冲激光（30 fs，800 nm，1 kHz）的不同能量密度下，单晶化学气相沉积 (CVD) 金刚石中从 sp 3键合到 sp 2键合碳部分的激光诱导石墨化程度辐照已被研究。发现四面体 CVD sp 3相在低于 3.9 J/cm 2的临界注量下主要转变为 sp 2芳族结晶石墨部分，在该临界注量之上主要形成无定形碳。能量密度从 3.3 到 3.9 J/cm 2 (~20%) 的分数增加导致 sp 2的深度显着增加（~3 倍）由于与飞秒激光照射相关的非线性相互作用，石墨化区域。此外，在临界阈值注量以下观察到 C=O 羰基的形成；随着30 fs激光辐照能量密度的增加，C=O解理逐渐发生。讨论了这些发现对增强 fs 驱动的钻石加工的影响。
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