Efficient multi-keV x-ray generation from a high-Z target irradiated with a clean ultra-short laser pulse.
Efficient multi-keV x-ray generation from a high-Z target irradiated with a clean ultra-short laser pulse.
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DOI：
10.1364/oe.19.004560
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发表时间：
2011-02
期刊：
影响因子：
3.8
通讯作者：
Zhe Zhang;M. Nishikino;Hiroaki Nishimura;T. Kawachi;A. Pirozhkov;A. Sagisaka;Satoshi Orimo;Koichi Ogura;A. Yogo;Y. Okano;S. Ohshima;S. Fujioka;H. Kiriyama;Kotaro Kondo;T. Shimomura;S. Kanazawa
中科院分区：
文献类型：
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作者：
Zhe Zhang;M. Nishikino;Hiroaki Nishimura;T. Kawachi;A. Pirozhkov;A. Sagisaka;Satoshi Orimo;Koichi Ogura;A. Yogo;Y. Okano;S. Ohshima;S. Fujioka;H. Kiriyama;Kotaro Kondo;T. Shimomura;S. Kanazawa
利用洁净的超高强度飞秒激光脉冲，对Mo和Ag板的Kα谱线发射进行了实验研究。测量了17 keV Mo和22 keV Ag的Kα x射线的绝对产额与激光脉冲对比度和辐照强度的关系。通过采用高对比度和高辐照度，Mo和Ag的Kα产额都得到了显著提高。在对比度为10毫<$$>到10毫<$$>的范围内，Mo和Ag的转换效率分别为4.28×10毫<$/sr和4.84×10毫<$/sr，这是迄今为止获得的最高值。
Kα line emissions from Mo and Ag plates were experimentally studied using clean, ultrahigh-intensity femtosecond laser pulses. The absolute yields of Kα x-rays at 17 keV from Mo and 22 keV from Ag were measured as a function of the laser pulse contrast ratio and irradiation intensity. Significantly enhanced Kα yields were obtained for both Mo and Ag by employing high contrast ratios and irradiances. Conversion efficiencies of 4.28×10⁻⁵/sr for Mo and 4.84×10⁻⁵/sr for Ag, the highest values obtained to date, were demonstrated with contrast ratios in the range 10⁻¹⁰ to 10⁻¹¹.