TY - GEN
T1 - Underwater rock drilling by CO2 laser
AU - Kobayashi, Toshio
AU - Otani, Kiyonobu
AU - Takayama, Kazuyoshi
AU - Umezu, Satoru
AU - Okatsu, Komei
PY - 2007/12/1
Y1 - 2007/12/1
N2 - As part of a fundamental study of rock drilling by laser irradiation, this paper describes the evolution of a cavitation cone created by pulsed CO2 (carbon dioxide) laser irradiation in water. A granite specimen submerged 50mm below the water surface was intermittently irradiated by a CO2 laser beam. High-speed video observations revealed the generation of an initial cone-shaped water cavity, propagation of the laser beam through the cavity and eventual ablation of the granite surface. The laser beam locally melts the granite surface to form small glassy beads, which are readily removable by mechanical methods. Repetition of this procedure demonstrated that a high-power laser beam propagating in water can be used to create a hole in rocks. This paper reports on the observed process by which molten granite is formed into small glass particles in the water.
AB - As part of a fundamental study of rock drilling by laser irradiation, this paper describes the evolution of a cavitation cone created by pulsed CO2 (carbon dioxide) laser irradiation in water. A granite specimen submerged 50mm below the water surface was intermittently irradiated by a CO2 laser beam. High-speed video observations revealed the generation of an initial cone-shaped water cavity, propagation of the laser beam through the cavity and eventual ablation of the granite surface. The laser beam locally melts the granite surface to form small glassy beads, which are readily removable by mechanical methods. Repetition of this procedure demonstrated that a high-power laser beam propagating in water can be used to create a hole in rocks. This paper reports on the observed process by which molten granite is formed into small glass particles in the water.
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M3 - Conference contribution
SN - 9780912035888
T3 - 26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007 - Congress Proceedings
BT - 26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007 - Congress Proceedings
T2 - 26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007
Y2 - 29 October 2007 through 1 November 2007
ER -