Koç Azıze, Hauf Chrıstoph, Woerner Mıchael, von Grafensteın Lorenz, Ueberschaer Dennıs, Bock Martin, Griebner Uwe, Elsaesser Thomas
Opt Lett. 2021 Jan 15;46(2):210-213. doi: 10.1364/OL.409522.
A novel, to the best of our knowledge, table-top hard X-ray source driven by femtosecond mid-infrared pulses provides 8 keV pulses at a 1 kHz repetition rate with an unprecedented flux of up to 1.5×10 X-ray photons/s. Sub-100 fs pulses at a center wavelength of 5 µm and multi-millijoule energy are generated in a four-stage optical parametric chirped-pulse amplifier and focused onto a thin Cu tape target. Electrons are extracted from the target and accelerated in a vacuum up to 100 keV kinetic energy during the optical cycle; the electrons generate a highly stable photon flux from the target in a transmission geometry.
据我们所知，一种新型的桌面式硬X射线源由飞秒中红外脉冲驱动，以1kHz的重复频率提供8keV的脉冲，通量高达1.5×10 X射线光子/秒，这是前所未有的。在四级光学参量啁啾脉冲放大器中产生中心波长为5μm、能量为多毫焦的亚100fs脉冲，并聚焦到薄铜带靶上。在光学周期内，电子从靶中提取并在真空中加速至100keV动能；电子在透射几何结构中从靶产生高度稳定的光子通量。
