Laser-induced structure transformations of diamonds

V. V. Kononenko; T. V. Kononenko; S. M. Pimenov; Vitali I. Konov; P. Fischer; V. Romano; H. P. Weber; A. V. Khomich; R. A. Khmelnitskiy; V. N. Strekalov

doi:10.1117/12.515610

2 September 2003 Laser-induced structure transformations of diamonds

V. V. Kononenko, T. V. Kononenko, S. M. Pimenov, Vitali I. Konov, P. Fischer, V. Romano, H. P. Weber, A. V. Khomich, R. A. Khmelnitskiy, V. N. Strekalov

Author Affiliations +

Proceedings Volume 5121, Laser Processing of Advanced Materials and Laser Microtechnologies; (2003) https://doi.org/10.1117/12.515610
Event: Laser Processing of Advanced Materials and Laser Microtechnologies, 2002, Moscow, Russian Federation

Abstract

Results are reported on the study of phase transformations in diamonds induced by nano- and picosecond pulses of KrF excimer laser (λ=248 nm) and second harmonic of a YAP:Nd laser (λ=539 nm). Main attention in the research was paid to i) laser-induced graphitization of high-quality CVD diamond plates and ii) laser-induced structure transitions in ion-implanted diamond single crystals. For CVD diamond, the thickness of the laser-graphitized surface layers was measured and the accumulation period for graphitization to occur was found to be longer for lower laser fluences. In the experiments with ion-implanted diamonds, multipulse laser irradiation at fluences lower than the graphitization thresholds resulted in progressive annealing, i.e., in an increase of the optical transmission and surface contraction. Under certain low-intensity irradiation conditions, it was also found that, competing with the annealing process, laser etching of the ion-implanted diamond occurred at extremely low rates of 10^-4-10^-3nm/pulse. A correlation between the defect concentration distribution and graphitization thresholds in partially annealed ion-implanted diamonds is discussed.

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V. V. Kononenko, T. V. Kononenko, S. M. Pimenov, Vitali I. Konov, P. Fischer, V. Romano, H. P. Weber, A. V. Khomich, R. A. Khmelnitskiy, and V. N. Strekalov "Laser-induced structure transformations of diamonds", Proc. SPIE 5121, Laser Processing of Advanced Materials and Laser Microtechnologies, (2 September 2003); https://doi.org/10.1117/12.515610

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