Table-top soft X-ray absorption spectroscopy based on high average/peak power femtosecond laser

基于高平均/峰值功率飞秒激光器的台式软X射线吸收光谱

• 批准号: 491812-2015
• 负责人: Légaré, François
• 金额: $ 7.26万
• 依托单位: Institut national de la recherche scientifique
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618901
• 关键词: Table; top; soft; ray; absorption

The discovery of X-rays in 1895 by Dr. William Roentgen has been an important step towards major breakthroughs in the last century. In medicine, this has had a major impact on our society by providing physicians with unique tools for diagnostics and treatments. In scientific research, X-rays are used for spectroscopic and structural characterization of atoms, molecules, biological structures and materials. Today, researchers from a broad diversity of scientific horizons, including biologists, chemists and physicists, are anticipating using X-ray laser pulses to probe dynamical processes with combined high spatial and high temporal resolutions. This quest motivates the construction of X-ray Free Electron Laser (XFEL) facilities around the world providing femtosecond X-ray laser pulses of high brilliance. The drawback of such facility, on top of its huge financial investment of billions of Euros, is its limited availability thus restraining the number of experiments that can be performed.Using the process of high harmonic generation (HHG), we will develop a table-top high flux X-ray laser to perform absorption measurements up to the Oxygen k-edge (2.4 nm) in oxide materials. To reach a high flux of soft X-ray photons, a new laser technology will be developed based on the concept of Frequency domain Optical Parametric Amplification - FOPA. This disruptive technology, developed by the INRS researchers, enables the efficient amplification of ultrashort pulses in the mid-infrared spectral range. Using a high average power picosecond pump laser for the FOPA, up to 50 W of average power will be available within 20 femtosecond pulses at 2 microns at a repetition rate of 10 kHz. Such a laser system will pave new applications for material characterization with X-rays, but also for the development of compact accelerators and bright THz sources.

威廉·伦琴博士于 1895 年发现 X 射线，是上世纪重大突破的重要一步。在医学领域，这为医生提供了独特的诊断和治疗工具，对我们的社会产生了重大影响。在科学研究中，X 射线用于原子、分子、生物结构和材料的光谱和结构表征。如今，来自不同科学领域的研究人员，包括生物学家、化学家和物理学家，都期望使用 X 射线激光脉冲来探测具有高空间和高时间分辨率的动态过程。这一追求推动了世界各地 X 射线自由电子激光器 (XFEL) 设施的建设，提供高亮度的飞秒 X 射线激光脉冲。这种设施的缺点是，除了其数十亿欧元的巨额财务投资之外，其可用性有限，从而限制了可以进行的实验数量。利用高次谐波发生（HHG）过程，我们将开发一个表格 -顶级高通量 X 射线激光器，可在氧化物材料中执行高达氧 k 边 (2.4 nm) 的吸收测量。为了达到高通量的软X射线光子，将基于频域光学参量放大（FOPA）概念开发一种新的激光技术。这项由 INRS 研究人员开发的颠覆性技术能够有效放大中红外光谱范围内的超短脉冲。使用用于 FOPA 的高平均功率皮秒泵浦激光器，在 2 微米、重复频率为 10 kHz 的 20 个飞秒脉冲内可提供高达 50 W 的平均功率。这种激光系统将为 X 射线材料表征以及紧凑型加速器和明亮太赫兹源的开发开辟新的应用。