Laser irradiation responses of a single-crystal diamond produced by different crystal growth methods

Nozomi Takayama, Jiwang Yan

Research output: Contribution to journalArticle

2 Citations (Scopus)

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.

Original languageEnglish
Article number815
JournalApplied Sciences (Switzerland)
Volume7
Issue number8
DOIs
Publication statusPublished - 2017 Aug 9

Fingerprint

Crystal Growth
Laser beam effects
Single Crystal
Strombus or kite or diamond
Crystal growth
Irradiation
Diamonds
Single crystals
Laser
Lasers
Machining
Reverse
Chemical Vapor Deposition
Graphite
Refractive Index
Chemical vapor deposition
Refractive index
Interference
Synthesis
Neodymium

Keywords

  • Crystal defect
  • Graphitization
  • Laser irradiation
  • Micro machining
  • Phase transformation
  • Single-crystal diamond

ASJC Scopus subject areas

  • Applied Mathematics

Cite this

Laser irradiation responses of a single-crystal diamond produced by different crystal growth methods. / Takayama, Nozomi; Yan, Jiwang.

In: Applied Sciences (Switzerland), Vol. 7, No. 8, 815, 09.08.2017.

Research output: Contribution to journalArticle

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