Spatial and temporal coherence properties of single free-electron laser pulses

被引：76

作者：

Singer, A. ^{[1
]}

Sorgenfrei, F. ^{[2
,3
]}

Mancuso, A. P. ^{[4
]}

Gerasimova, N. ^{[1
]}

Yefanov, O. M. ^{[1
]}

Gulden, J. ^{[1
]}

Gorniak, T. ^{[5
,6
]}

Senkbeil, T. ^{[5
,6
]}

Sakdinawat, A. ^{[7
]}

Liu, Y. ^{[8
]}

Attwood, D. ^{[8
]}

Dziarzhytski, S. ^{[1
]}

Mai, D. D. ^{[9
]}

Treusch, R. ^{[1
]}

Weckert, E. ^{[1
]}

Salditt, T. ^{[9
]}

Rosenhahn, A. ^{[5
,6
]}

Wurth, W. ^{[2
,3
]}

Vartanyants, I. A. ^{[1
,10
]}

机构：

[1] Deutsch Elektronen Synchrotron DESY, D-22607 Hamburg, Germany

[2] Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany

[3] Univ Hamburg, CFEL, D-22761 Hamburg, Germany

[4] European XFEL GmbH, D-22761 Hamburg, Germany

[5] Heidelberg Univ, D-69120 Heidelberg, Germany

[6] Karlsruhe Inst Technol, Inst Funct Interfaces, D-76344 Eggenstein Leopoldshafen, Germany

[7] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[8] Univ Calif Berkeley, Berkeley, CA 94720 USA

[9] Univ Gottingen, Inst Rontgenphys, D-37077 Gottingen, Germany

[10] Natl Res Nucl Univ, MEPhI, Moscow 115409, Russia

来源：

OPTICS EXPRESS | 2012年 / 20卷 / 16期

关键词：

EXTREME-ULTRAVIOLET; OPERATION;

D O I：

10.1364/OE.20.017480

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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 10x10 mu m(2) were measured. A transverse coherence length of 6.2 +/- 0.9 mu m in the horizontal and 8.7 +/- 1.0 mu m 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. (C) 2012 Optical Society of America

引用

页码：17480 / 17495

页数：16

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