A new self-diffraction pattern formation in defocusing liquid media

R. G. Harrison, L. Dambly, Dejin Yu, Weiping Lu

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


We report on steady-state dark spot formation in the center of the far field of a divergent Gaussian beam transmitted through a thin absorbing defocusing liquid medium. The size of the dark region is found to be approximately conserved with increase of incident pump power. Theoretical analysis shows a good quantitative agreement with our experimental measurements, establishing the physical origin of such a pattern formation to arise from interplay between wavefront curvature of the input Gaussian beam and strong spatial self-phase modulation by thermally-induced refractive index change in the medium, which we show to be dominated by longitudinal thermal diffusion.

Original languageEnglish
Pages (from-to)69-72
Number of pages4
JournalOptics Communications
Issue number1-3
Publication statusPublished - 15 Jun 1997


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