Transient structure of ionized atmosphere in pulsed laser propulsion system

Koji Takahashi; Kohei Maeda; Tatsuya Ikuta; Sachiko Hatano; Yasuhito Mori; Kunihito Nagayama

doi:10.1117/12.424251

17 April 2001 Transient structure of ionized atmosphere in pulsed laser propulsion system

Koji Takahashi, Kohei Maeda, Tatsuya Ikuta, Sachiko Hatano, Yasuhito Mori, Kunihito Nagayama

Proceedings Volume 4183, 24th International Congress on High-Speed Photography and Photonics; (2001) https://doi.org/10.1117/12.424251
Event: 24th International Congress on High-Speed Photography and Photonics, 2000, Sendai, Japan

Abstract

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.

Citation Download Citation

Koji Takahashi, Kohei Maeda, Tatsuya Ikuta, Sachiko Hatano, Yasuhito Mori, and Kunihito Nagayama "Transient structure of ionized atmosphere in pulsed laser propulsion system", Proc. SPIE 4183, 24th International Congress on High-Speed Photography and Photonics, (17 April 2001); https://doi.org/10.1117/12.424251

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