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: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=657115
• 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.**

1895年威廉·伦琴博士发现了X射线，这是上个世纪取得重大突破的重要一步。在医学上，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。今天，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，预计将使用X射线激光脉冲来探测具有高空间和高时间分辨率的动力学过程。这一探索推动了在世界各地建造X射线自由电子激光(XFEL)设施，提供高亮度的飞秒X射线激光脉冲。除了数十亿欧元的巨额财政投资外，这种设备的缺点是可获得性有限，从而限制了可以进行的实验数量。*利用高次谐波产生(HHG)的过程，我们将开发一种台式高通量X射线激光，用于对氧化物材料中氧的k边(2.4 nm)进行吸收测量。为了获得高通量的软X射线光子，基于频域光学参变放大的概念将发展一种新的激光技术--FOPA。这项由INRS研究人员开发的颠覆性技术能够有效地放大中红外光谱范围内的超短脉冲。使用高平均功率的皮秒泵浦激光器，在2微米、重复频率10 kHz的20个飞秒脉冲内，可获得高达50W的平均功率。这样的激光系统将为用X射线表征材料铺平新的应用，也将为紧凑型加速器和明亮的太赫兹光源的发展铺平道路。