Advances Toward Inner-Shell Photo-Ionization X-Ray Lasing at 45 (Angstrom) [electronic resource].

Published: Washington, D.C. : United States. Dept. of Energy, 2002.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description: PDF-FILE: 10 ; SIZE: 0.5 MBYTES pages
Additional Creators: Lawrence Livermore National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary

The inner-shell photo-ionization (ISPI) scheme requires photon energies at least high enough to photo-ionize the K-shell. ≈286 eV, in the case of carbon. As a consequence of the higher cross-section, the inner-shell are selectively knocked out, leaving a hole state 1s2s²2p² in the singly charged carbon ion. This generates a population inversion to the radiatively connected state 1s²2s²2p in C+, leading to gain on the 1s-2p transition at 45 Å. The resonant character of the lasing transition in the single ionization state intrinsically allows much higher quantum efficiency compared to other schemes. Competing processes that deplete the population inversion include auto-ionization, Auger decay, and in particular collisional ionization of the outer-shell electrons by electrons generated during photo-ionization. These competing processes rapidly quench the gain. Consequently, the pump method must be capable of populating the inversion at a rate faster than the competing processes. This can be achieved by an ultra-fast, high intensity laser that is able to generate an ultra-fast, bright x-ray source. With current advances in the development of high-power, ultra-short pulse lasers it is possible to realize fast x-ray sources based that can deliver powerful pulses of light in the multiple hundred terawatt regime and beyond. They will discuss in greater detail concept, target design and a series of x-ray spectroscopy investigations they have conducted in order to optimize the absorber/x-ray converter--filter package.

Report Numbers

E 1.99:ucrl-jc-147936
ucrl-jc-147936

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Note

Published through SciTech Connect.
07/18/2002.
"ucrl-jc-147936"
8th International Conference on X-Ray Lasers, Aspen, CO (US), 05/27/2002--05/31/2002.
Weber, F A; Celliers, P M; Moon, S J; Eder, D C.

Funding Information

W-7405-ENG-48

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