Analysis of dark spot formation in absorbing liquid media

Dejin Yu, Weiping Lu, R. G. Harrison, N. N. Rosanov

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


A theoretical analysis based on coupled field-matter equations is given to describe the recently observed phenomenon of a central dark spot formation of a Gaussian beam transmitted through an absorbing defocusing liquid medium. We find that such a pattern formation, which is accompanied by normal defocusing rings in the far field, originates from interplay between the wave-front curvature of the Gaussian beam and strong spatial self-phase modulation arising from thermally induced refractive index change in the medium. Results of numerical analysis for a thin medium are shown to be in a good quantitative agreement with our experimental findings. Further, the dark spot formation is also predicted by using a focused Gaussian beam and self-focusing medium.

Original languageEnglish
Pages (from-to)2597-2606
Number of pages10
JournalJournal of Modern Optics
Issue number12
Publication statusPublished - Dec 1998


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