Quasi-monochromatic modes of quasi-stationary, pulsed scalar optical fields

被引:1
作者
Ahad, Lutful [1 ]
Vartiainen, Ismo [1 ]
Setala, Tero [1 ]
Friberg, Ari T. [1 ]
Turunen, Jari [1 ]
机构
[1] Univ Eastern Finland, Inst Photon, POB 111, FI-80101 Joensuu, Finland
基金
芬兰科学院;
关键词
SPACE-FREQUENCY DOMAIN; PARTIALLY COHERENT FIELDS; REPRESENTATION; DECOMPOSITION; BEAMS;
D O I
10.1364/JOSAA.34.001469
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We investigate the temporal coherence of random, pulsed, quasi-stationary scalar light fields and introduce a new type of expansion for the mutual coherence function in terms of fully coherent frequency-shifted quasi-monochromatic modes of identical shape. The mode representation is valid provided the pulse length is shorter and the coherence time is much shorter than the width of the time window in which the field is considered. The construction of the expansion is particularly straightforward since information is required only on the average spectrum and the average temporal intensity. The method enables us to assess the coherence properties of quasi-stationary light by analyzing the behavior of deterministic quasi-monochromatic fields. The frequency-domain counterpart of the representation is also given. The method is illustrated by application to a pulsed free-electron laser source. (C) 2017 Optical Society of America
引用
收藏
页码:1469 / 1475
页数:7
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