Effect of absorbing coating on ablation of diamond by IR laser pulses. (March 2018)

• Record Type: Journal Article
• Authors: Kononenko, T.V.; Pivovarov, P.A.; Khomich, A.A.; Khmelnitskii, R.A.; Konov, V.I.
• Is Part Of: Quantum electronics. Volume 48:Number 3(2018)
• Page Start: 244
• Page End: 250
• Publication Date: 2018-03
• Subjects: laser ablation -- microstructuring -- diamond -- absorbing coating; Quantum electronics -- Periodicals; 537.5
• DOI: 10.1070/QEL16567
• Languages: English
• ISSNs: 1063-7818

Abstract

Abstract: We study the possibility of increasing the efficiency and quality of laser ablation microprocessing of diamond by preliminary forming an absorbing layer on its surface. The laser pulses having a duration of 1 ps and 10 ns at a wavelength of 1030 nm irradiate the polycrystalline diamond surface coated by a thin layer of titanium or graphite. We analyse the dynamics of the growth of the crater depth as a function of the number of pulses and the change in optical transmission of the ablated surface. It is found that under irradiation by picosecond pulses the preliminary graphitisation allows one to avoid the laser-induced damage of the internal diamond volume until the appearance of a self-maintained graphitised layer. The absorbing coating (both graphite and titanium) much stronger affects ablation by nanosecond pulses, since it reduces the ablation threshold by more than an order of magnitude and allows full elimination of a laser-induced damage of deep regions of diamond and uncontrolled explosive ablation in the near-surface layer.