Experimental study of underwater rock drilling using a pulsed Ho:YAG laser-induced jets

K. Ohtani, D. Numata, K. Takayama, T. Kobayashi, K. Okatsu

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


This paper is primarily an assessment of laser-induced water jets for boring rock surfaces. It also reports the result of preliminary experiments of pulsed Ho:YAG laser-induced jets applied to drill a submerged rock specimen. The irradiation of pulsedHo:YAGlaser beams at 3Hzinside a thin metal tube produces intermittent water vapor bubbles which result in liquid jet discharge from the exit of the metal tube. The laser-induced water jets are visualized by shadowgraphs and images are recorded by a high-speed digital video camera. High stagnation pressures were eventually generated by the jet impingements. Simultaneously shock waves of about 22.7MPa were generated at bubble collapse, which effectively cracked the surface of the rock specimens. Repeated exposures of these laser-induced jets against submerged rock specimens have a potential to practically bore holes on rock surfaces.

Original languageEnglish
Pages (from-to)403-412
Number of pages10
JournalShock Waves
Issue number5
Publication statusPublished - 2009


  • Bubble
  • Ho:YAG laser
  • Laser-induced liquid jet
  • Shock wave


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