On spectral and temporal coherence of x-ray free-electron laser beams

被引：8

作者：

Ahad, Lutful ^{[1
]}

Vartiainen, Ismo ^{[1
]}

Setala, Tero ^{[1
]}

Friberg, Ari T. ^{[1
]}

David, Christian ^{[2
]}

Makita, Mikako ^{[2
]}

Turunen, Jari ^{[1
]}

机构：

[1] Univ Eastern Finland, Inst Photon, POB 111, FI-80101 Joensuu, Finland

[2] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

来源：

OPTICS EXPRESS | 2016年 / 24卷 / 12期

基金：

芬兰科学院;

关键词：

Laser theory - Gaussian beams - Electrons - Laser beams - Iterative methods;

D O I：

10.1364/OE.24.013081

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A model for the coherence properties of free-electron lasers (FELs) in time and frequency domains is introduced within the framework of classical second-order coherence theory of nonstationary light. An iterative phase-retrieval algorithm is applied to construct an ensemble of field realizations in both domains, based on single-pulse spectra measured at the Linac Coherent Light Source (LCLS) in self-amplified spontaneous emission mode. Such an ensemble describes the specific FEL pulse train in a statistically averaged sense. Two-time and two-frequency correlation functions are constructed, demonstrating that the hard X-ray free-electron laser at LCLS in this case behaves as a quasistationary source with low spectral and temporal coherence. We also show that the Gaussian Schell model provides a good description of this FEL. (C) 2016 Optical Society of America

引用

页码：13081 / 13090

页数：10

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