具有高对比度的100Hz、15mJ飞秒激光系统的K(α)X射线发射特性
K(alpha) x-ray emission characterization of 100 Hz, 15 mJ femtosecond laser system with high contrast ratio.
作者信息
Fourmaux S, Serbanescu C, Kincaid R E, Krol A, Kieffer J C
机构信息
INRS-EMT, Université du Québec, Varennes, J3X 1S2, Canada,
出版信息
Appl Phys B. 2008 Dec 12;94(4):569-575. doi: 10.1007/s00340-008-3342-6.
Abstract
We report K(alpha) 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 x 10(-5) with a Mo target, and the x-ray spot size close to the optical focal spot. This high-repetition K(alpha) x-ray source can be very useful for x-ray phase-contrast imaging.
摘要
我们报道了利用一种高能量（压缩前800纳米处每脉冲110毫焦/压缩后400纳米处15毫焦）、高重复频率（100赫兹）以及高脉冲对比度（400纳米处优于10⁻⁹）的激光系统产生Kα X射线的情况。为开发用于生物医学成像的基于激光的X射线源，需要使用在真空中实现压缩的高能量和高功率超快激光系统。利用这种类型的激光系统，我们展示了X射线产额的长期稳定性、使用钼靶时高于1.5×10⁻⁵的转换效率，以及接近光学焦斑的X射线光斑尺寸。这种高重复频率的Kα X射线源对于X射线相衬成像可能非常有用。
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