K(alpha) x-ray emission characterization of 100 Hz, 15 mJ femtosecond laser system with high contrast ratio.

K(alpha) x-ray emission characterization of 100 Hz, 15 mJ femtosecond laser system with high contrast ratio.
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DOI:
10.1007/s00340-008-3342-6
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发表时间:
2008-12-12
影响因子:
2.1
通讯作者:
Kieffer, J. C.
Kieffer, J. C.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Fourmaux, S.;Serbanescu, C.;Kincaid, R. E., Jr.;Krol, A.;Kieffer, J. C.

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我们报道了一个高能量(压缩前800 nm每脉冲110 mJ /压缩后400 nm 15 mJ /脉冲)、高重复率(100 Hz)和高脉冲对比度(400 nm优于10−9)的Kα x射线激光系统。为了开发用于生物医学成像的基于激光的x射线源,需要使用高能、高功率的超快激光系统,在真空下实现压缩。使用这种类型的激光系统,我们证明了x射线产率的长期稳定性,在Mo目标下的转换效率高于1.5 × 10−5,并且x射线光斑的大小接近光学焦斑。这种高重复Kα x射线源可以非常有用的x射线相衬成像。
We report Kα x-ray production with a high energy (110 mJ per pulse at 800 nm before compression/15 mJ at 400 nm after compression), high repetition rate (100 Hz), and high pulse contrast (better than 10−9 at 400 nm) laser system. To develop laser-based x-ray sources for biomedical imaging requires to use high-energy and high-power ultra-fast laser system where compression is achieved under vacuum. Using this type of laser system, we demonstrate long-term stability of the x-ray yield, conversion efficiency higher than 1.5 × 10−5 with a Mo target, and the x-ray spot size close to the optical focal spot. This high-repetition Kα x-ray source can be very useful for x-ray phase-contrast imaging.
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影响因子: 3.6
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