Tampere University of Technology

TUTCRIS Research Portal

Two-time coherence of pulse trains and the integrated degree of temporal coherence

Research output: Contribution to journalArticleScientificpeer-review


Original languageEnglish
Pages (from-to)1631-1637
Number of pages7
JournalJournal of the Optical Society of America A: Optics Image Science and Vision
Issue number9
Publication statusPublished - 2015
Publication typeA1 Journal article-refereed


We examine the temporal coherence properties of trains of nonidentical short optical pulses in the framework of the second-order coherence theory of nonstationary light. Considering Michelson's interferometric measurement of temporal coherence, we demonstrate that time-resolved interferograms reveal the full two-time temporal coherence function of the partially coherent pulse train. We also show that the result given by the time-integrated Michelson interferogram equals the true degree of temporal coherence only when the pulse train is quasistationary, i.e., the coherence time is a small fraction of the pulse duration. True two-time and integrated coherence functions produced by specific models representing perturbed trains of mode-locked pulses and supercontinuum pulse trains produced in nonlinear fibers are illustrated.