Effect of absorbing coating on ablation of diamond by IR laser pulses

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 coate...

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Bibliographic Details
Published inQuantum electronics (Woodbury, N.Y.) Vol. 48; no. 3; pp. 244 - 250
Main Authors Kononenko, T.V., Pivovarov, P.A., Khomich, A.A., Khmelnitskii, R.A., Konov, V.I.
Format Journal Article
LanguageEnglish
Published Bristol Kvantovaya Elektronika, Turpion Ltd and IOP Publishing 01.03.2018
IOP Publishing
Subjects
ABLATION
absorbing coating
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Coating effects
diamond
Diamond films
DIAMONDS
GRAPHITE
INFRARED SPECTRA
IRRADIATION
Laser ablation
Laser damage
LASERS
LIGHT TRANSMISSION
microstructuring
NANOSCIENCE AND NANOTECHNOLOGY
Nanosecond pulses
Picosecond pulses
Polycrystalline diamond
POLYCRYSTALS
PULSES
Surface layers
SURFACES
THIN FILMS
TITANIUM
WAVELENGTHS
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Summary: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.
ISSN:1063-7818
1468-4799
DOI:10.1070/QEL16567