作为VUV波长范围内的窄带带通滤波器的充气单元
Gas-filled cell as a narrow bandwidth bandpass filter in the VUV wavelength range
摘要：
我们提出了一种方法，用于光谱过滤辐射在真空紫外波长范围内的装置的单色器构成的细胞充满了共振吸收的稀有气体。在特定波长附近，气体呈现出遵循Fano分布的窄带吸收共振。特别地，在60 eV - 65 eV的光子能量范围内，氦中光电离光谱的Fano分布的相关指数等于1，这意味着截面的最小值恰好为零。对于气室中足够大的柱密度，入射辐射的光谱将被许多数量级的背景横截面衰减，除了接近横截面为零的那些波长。基于这一原理的气体单色器的显著优点是简单、高效和窄带宽。在真空紫外SASE自由电子激光装置的实验大厅中安装了一台气体单色器，它将使单模真空紫外激光束的输出成为可能。该设计与现有的真空紫外或X射线自由电子激光气体衰减器系统相同。我们目前的可行性研究和示范的FLASH设施在真空紫外制度。
英文摘要：
We propose a method for spectrally filtering radiation in the VUV wavelength range by means of a monochromator constituted by a cell filled with a resonantly absorbing rare gas. Around particular wavelengths, the gas exhibits narrow-bandwidth absorbing resonances following the Fano profile. In particular, within the photon energy range 60 eV - 65 eV, the correlation index of the Fano profiles for the photo-ionization spectra in Helium is equal to unity, meaning that the minimum of the cross-section is exactly zero. For sufficiently large column density in the gas cell, the spectrum of the incoming radiation will be attenuated by the background cross-section of many orders of magnitude, except for those wavelengths close to the point where the cross-section is zero. Remarkable advantages of a gas monochromator based on this principle are simplicity, efficiency and narrow-bandwidth. A gas monochromator installed in the experimental hall of a VUV SASE FEL facility would enable the delivery of a single-mode VUV laser beam. The design is identical to that of already existing gas attenuator systems for VUV or X-ray FELs. We present feasibility study and exemplifications for the FLASH facility in the VUV regime.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
