Dislocation arrays in sapphire using femtosecond laser irradiation

Chiwon Moon, Shingo Kanehira, Kiyotaka Miura, Eita Tochigi, Naoya Shibata, Yuichi Ikuhara, Kazuyuki Hirao

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    We investigated the formation mechanism and thermal behaviors of defects which were introduced at a microscopic area inside (1120) sapphire using femtosecond laser. Cracks were formed at the focal point along the {1102} and the {1100} planes by the laser irradiation. The preferential crack formation on these planes was attributed to the different fracture surface energy between the crystallographic planes of sapphire. The cracks transformed into the array of discrete pores by the subsequent heat treatment above 1300 °C, which was due to the diffusive crack healing process. In addition, dislocations were also introduced at the interface between closed cracks.

    Original languageEnglish
    Title of host publicationNanoscale Pattern Formation
    Number of pages5
    Publication statusPublished - 2010 Oct 15
    Event2009 MRS Fall Meeting - Boston, MA, United States
    Duration: 2009 Nov 302009 Dec 4

    Publication series

    NameMaterials Research Society Symposium Proceedings
    ISSN (Print)0272-9172


    Other2009 MRS Fall Meeting
    Country/TerritoryUnited States
    CityBoston, MA

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering


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