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Proceedings Paper

Development of highly advanced soft x-ray lasers for biomedical and nano-laser medicine applications
Author(s): H. Kuroda; Rashid A. Ganeev; M. Suzuki; Motoyoshi Baba; J. Zhang; T. Ozaki
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Paper Abstract

Current activities on our research of soft X-ray lasers and higher harmonic generations using intense, subpicosecond lasers are reviewed. Especially for soft X-ray lasers we experimentally demonstrate that by longitudinally pumping 2-mm-long molybdenum preformed plasma with high-intensity 475 fs duration laser pulse, a highly directive soft-X-ray laser at 18.9 nm wavelength is generated. The divergence of the beam is evaluated to be of the submillirad order, and only requires pump laser energy of 150 mJ. Simulations show that the pedestal in the main pump pulse can generate electron density and gain profiles with large spatial gradients, which result in the selective amplification of low-order transverse modes. The present result is the demonstration of an efficient and alternative method of improving the spatial coherence of X-ray lasers with amplified spontaneous emission medium, with possibilities of becoming an excellent tool to explore various application experiments. In higher harmonic generation, topics related to observation of blue shift due to collisionless absorption process is described.

Paper Details

Date Published: 11 September 2006
PDF: 8 pages
Proc. SPIE 5967, 2004 Shanghai International Conference on Laser Medicine and Surgery, 596708 (11 September 2006); doi: 10.1117/12.639108
Show Author Affiliations
H. Kuroda, Univ. of Tokyo (Japan)
Rashid A. Ganeev, Univ. of Tokyo (Japan)
M. Suzuki, Univ. of Tokyo (Japan)
Motoyoshi Baba, Univ. of Tokyo (Japan)
J. Zhang, Univ. of Tokyo (Japan)
T. Ozaki, INRS (Canada)

Published in SPIE Proceedings Vol. 5967:
2004 Shanghai International Conference on Laser Medicine and Surgery
Jing Zhu, Editor(s)

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