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All-optical guided-wave random laser in nematic liquid crystals

Research output: Contribution to journalArticleScientificpeer-review


Original languageEnglish
Pages (from-to)4672-4679
Number of pages8
JournalOptics Express
Issue number5
Publication statusPublished - 2017
Publication typeA1 Journal article-refereed


Spatial solitons can affect and enhance random lasing in optically-pumped dye-doped nematic liquid crystals. Upon launching two collinear beams in the sample, the first to pump the fluorescent guest molecules and the second to induce a reorientational soliton, strikingly the second beam not only guides the emitted photons in the soliton waveguide, but also enhances the lasing efficiency and modulates its spectral width. By altering the scattering paths of the emitted photons, the soliton also contributes to the selection of the lasing modes, as further confirmed by the observed kinks in the input/output characteristics. These experimental results demonstrate that random lasing can be efficiently controlled by a light beam which does not interact with the gain molecules, opening a route towards light-controlled random lasers.

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Field of science, Statistics Finland

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