Transient structure of ionized atmosphere in pulsed laser propulsion system

Koji Takahashi, K. Maeda, T. Ikuta, S. Hatano, Y. Mori, K. Nagayama

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


Optical breakdown of air is explored by using high-speed photography for the realization of laser propulsion system in aerospace engineering. The multiple ionization and subsequent pear-shaped emission by laser pulse through a convex lens are recorded and analyzed by image converter camera. The improved pulsed-laser shadowgraphy employed in this system successfully enables us to visualize the transient structures of complicated shock waves more clearly than ever. The ionization just above the surface of an aluminum target is also examined in comparison with the case of no target, which may be the major mechanism of Myrabo's demonstration of a small flyer launching by a pulsed carbon dioxide laser. Not only the high-enthalpy states of the ionized atmosphere are calculated but also the precise history of breakdown initiation in the nanosecond laser pulse is obtained.

Original languageEnglish
Pages (from-to)907-916
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - Jan 1 2001
Event24th International Congress on High-Speed Photography and Photonics - Sendai, Japan
Duration: Sep 24 2000Sep 29 2000

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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