AN OPTICAL FIELD-INDUCED IONIZATION X-RAY LASER USING A PREFORMED PLASMA SCHEME

被引:14
作者
MIDORIKAWA, K
NAGATA, Y
KUBODERA, S
OBARA, M
TOYODA, K
机构
[1] KEIO UNIV,DEPT ELECT ENGN,KOHOKU KU,YOKOHAMA,KANAGAWA 223,JAPAN
[2] MIYAZAKI UNIV,DEPT ELECT & ELECTR ENGN,MIYAZAKI 88921,JAPAN
关键词
D O I
10.1109/2944.473664
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Soft X-ray amplification by optical field-induced ionization (OFI) of a preformed plasma is investigated. A small-signal gain of 20 cm(-1) and a gain-length product of 4 at 13.5 mn on the Lyman-alpha transition in hydrogen-like lithium have been obtained using the modified OFI scheme. Experimental and numerical results ensure that we have produced a plasma with a significantly lower electron temperature than what is expected by an above-threshold ionization model. To explain the results, a two-component plasma model in which relatively high temperature electrons are produced by OM in a cold electron bath of the preformed plasma is presented. The model indicates that the average electron temperature of the OFI plasma rapidly decreases since a high-temperature part of the electrons escapes from the focal volume without interaction. The initial electrons produced prior to the field ionization, which survive after the OFI, also significantly contribute to the rapid three-body recombination. Based on the ionization-induced refractive index change, the pulse propagation of a high-intensity pump laser during the OFI is also discussed.
引用
收藏
页码:931 / 940
页数:10
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