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.**

威廉·罗恩根（William Roentgen）博士在1895年发现X射线是迈向上个世纪重大突破的重要一步。在医学方面，这对我们的社会产生了重大影响，通过为医生提供独特的诊断和治疗工具。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，包括生物学家，化学家和物理学家在内的各种科学视野的研究人员都预计，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。这项任务激发了世界各地的X射线免费电子激光器（XFEL）设施的构建，提供高光彩的飞秒X射线激光脉冲。除了其数十亿欧元的巨额财务投资之外，其可用性有限，因此限制了可以执行的实验数量。 为了达到软X射线光子的高通量，将根据频域光学参数放大-FOPA的概念开发新的激光技术。 INRS研究人员开发的这种破坏性技术可以在中红外光谱范围内有效地扩增超短脉冲。使用FOPA的高平均功率皮秒泵激光器，以2微米的重复速率以10 kHz的速度以20微米为单位，将在20秒脉冲范围内提供高达50 W的平均功率。这种激光系统将用X射线铺平新的应用程序，以用于X射线表征，还可以开发紧凑的加速器和明亮的THZ来源。**