期刊
OPTICS EXPRESS
卷 21, 期 11, 页码 13005-13017出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.21.013005
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资金
- Deutsche Forschungsgemeinschaft [SFB 755]
- BMBF [05K10VH4, 05K10CHG]
- Virtual Institute (Helmholtz Assoc.) [VI-403]
The spatial coherence of free-electron laser radiation in the water window spectral range was studied, using the third harmonic (lambda(3rd) = 2.66 nm) of DESY's Free-electron LASer in Hamburg (FLASH). Coherent single pulse diffraction patterns of 1,2-Dioleoyl-sn-glycero-3-phosphocholine (DOPC) multilamellar lipid stacks have been recorded. The intensity histogram of the speckle pattern around the first lamellar Bragg peak, corresponding to the d = 5 nm periodicity of the stack, reveals an average number of transverse modes of (m) over bar = 3.0 of the 3rd harmonic. Using the lipid stack as a 'monochromator', pulse-to-pulse fluctuations in the third harmonic lambda(3rd) have been determined to be 0.033 nm. (C) 2013 Optical Society of America
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