The effect of laser contrast on generation of highly charged Fe ions by ultra-intense femtosecond laser pulses
The effect of laser contrast on generation of highly charged Fe ions by ultra-intense femtosecond laser pulses
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DOI：
10.1007/s00340-017-6771-2
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发表时间：
2017-06
期刊：
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通讯作者：
A. Faenov;M. Alkhimova;T. Pikuz;I. Skobelev;M. Nishiuchi;H. Sakaki;A. Pirozhkov;A. Sagisaka;N. Dover;K. Kondo;K. Ogura;Y. Fukuda;H. Kiriyama;A. Andreev;Keita Nishitani;T. Miyahara;Y. Watanabe;S. Pikuz;M. Kando;R. Kodama;K. Kondo
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文献类型：
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作者：
A. Faenov;M. Alkhimova;T. Pikuz;I. Skobelev;M. Nishiuchi;H. Sakaki;A. Pirozhkov;A. Sagisaka;N. Dover;K. Kondo;K. Ogura;Y. Fukuda;H. Kiriyama;A. Andreev;Keita Nishitani;T. Miyahara;Y. Watanabe;S. Pikuz;M. Kando;R. Kodama;K. Kondo
利用不同对比度的飞秒激光脉冲，对中Z元素的高电荷态离子进行了实验研究。激光脉冲宽度为35fs，强度超过1021W/cm2，产生了多电荷铁离子。利用高分辨X射线能谱方法，确定了产生的等离子体的体电子温度。结果表明，对比度为105-106的激光预脉冲的存在大大降低了Fe的电离度。我们的结论是，只有使用超高对比度的激光脉冲才能产生基于飞秒激光-等离子体相互作用的高能量、多电荷的中、高Zion离子的有效来源。
Experimental studies on the formation of highly charged ions of medium-Z elements using femtosecond laser pulses with different contrast levels were carried out. Multiply charged Fe ions were generated by laser pulses with 35 fs duration and an intensity exceeding 1021W/cm2. Using high-resolution X-ray spectroscopic methods, bulk electron temperature of the generated plasma has been identified. It is shown that the presence of a laser pre-pulse at a contrast level of 105–106with respect to the main pulse drastically decreases the degree of Fe ionization. We conclude that an effective source of energetic, multiply charged moderate and high-Zions based on femtosecond laser–plasma interactions can be created only using laser pulses of ultra-high contrast.