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Appl. Sci. 2017, 7(8), 815; doi:10.3390/app7080815

Laser Irradiation Responses of a Single-Crystal Diamond Produced by Different Crystal Growth Methods

Department of Mechanical Engineering, Keio University, Hiyoshi 3-14-1 Kohoku, Yokohama, Kanagawa 223-8522, Japan
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Received: 18 June 2017 / Revised: 3 August 2017 / Accepted: 7 August 2017 / Published: 9 August 2017
(This article belongs to the Section Materials)
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Abstract

Responses of two types of single-crystal diamonds, prepared by chemical vapour deposition (CVD) and high pressure high temperature synthesis (HPHT) methods, respectively, to a nanosecond pulsed neodymium-doped yttrium aluminium garnet (Nd:YAG) laser were investigated and compared. It was found that due to the difference in the transmission rate and refractive index, the laser-induced surface/subsurface features of the two types of samples were distinctly different. For the CVD sample, destructive interference takes place on the upper surface, leading to direct ablation of smooth grooves with deposition of graphite. For the HPHT sample, however, laser-induced grooves were formed on the reverse side of the irradiation surface (namely, the lower surface) at certain laser fluences due to the constructive interference phenomenon of the laser and the high refractive index of the material. The reverse-side irradiation resulted in the formation of deep and sharp grooves with rough bottoms and insignificant deposition of graphite on the area surrounding the groove. The machining thresholds for the upper and lower surfaces of both types of diamonds were experimentally obtained and theoretically verified. The findings of this study provide important process criteria for laser machining of different kinds of diamonds. The reverse-side irradiation method enables efficient machining of deep grooves in diamonds using a lower power laser. View Full-Text
Keywords: single-crystal diamond; laser irradiation; micro machining; phase transformation; graphitization; crystal defect single-crystal diamond; laser irradiation; micro machining; phase transformation; graphitization; crystal defect
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Takayama, N.; Yan, J. Laser Irradiation Responses of a Single-Crystal Diamond Produced by Different Crystal Growth Methods. Appl. Sci. 2017, 7, 815.

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