Spatial and temporal coherence properties of single free-electron laser pulses.
Spatial and temporal coherence properties of single free-electron laser pulses.
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DOI：
10.1364/oe.20.017480
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发表时间：
2012-06
期刊：
影响因子：
3.8
通讯作者：
Andrej Singer;F. Sorgenfrei;A. Mancuso;N. Gerasimova;O. Yefanov;J. Gulden;T. Gorniak;T. Senkbeil;A. Sakdinawat;Yanwei Liu;D. Attwood;S. Dziarzhytski;D. Mai;R. Treusch;E. Weckert;Tim Salditt;Axel Rosenhahn;W. Wurth;I. Vartanyants
中科院分区：
文献类型：
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作者：
Andrej Singer;F. Sorgenfrei;A. Mancuso;N. Gerasimova;O. Yefanov;J. Gulden;T. Gorniak;T. Senkbeil;A. Sakdinawat;Yanwei Liu;D. Attwood;S. Dziarzhytski;D. Mai;R. Treusch;E. Weckert;Tim Salditt;Axel Rosenhahn;W. Wurth;I. Vartanyants
给出了波长为8.0nm的汉堡自由电子激光器（FLASH）的空间和时间相干特性的实验表征。测量了聚焦到约10×10 μm（2）的单飞秒脉冲的双针孔衍射图样。从最相干的脉冲中测得横向相干长度为6.2 ± 0.9 μm和8.7 ± 1.0 μm。用分裂延迟器测得在相同FLASH工作条件下产生的脉冲的相干时间为1.75 ± 0.01fs。根据我们的实验，我们估计FLASH光束的简并参数在10（10）到10（11）的数量级上，这超过了在相同能量范围内的任何其他源的该参数的值许多数量级。
The experimental characterization of the spatial and temporal coherence properties of the free-electron laser in Hamburg (FLASH) at a wavelength of 8.0 nm is presented. Double pinhole diffraction patterns of single femtosecond pulses focused to a size of about 10×10 μm(2) were measured. A transverse coherence length of 6.2 ± 0.9 μm in the horizontal and 8.7 ± 1.0 μm in the vertical direction was determined from the most coherent pulses. Using a split and delay unit the coherence time of the pulses produced in the same operation conditions of FLASH was measured to be 1.75 ± 0.01 fs. From our experiment we estimated the degeneracy parameter of the FLASH beam to be on the order of 10(10) to 10(11), which exceeds the values of this parameter at any other source in the same energy range by many orders of magnitude.