Beaming random lasers with soliton control

Nature Communications
Sreekanth PerumbilavilGaetano Assanto

Abstract

Random lasers are resonator-less light sources where feedback stems from recurrent scattering at the expense of spatial profile and directionality. Suitably-doped nematic liquid crystals can random lase when optically pumped near resonance(s); moreover, through molecular reorientation within the transparency region, they support self-guided optical spatial solitons, i.e., light-induced waveguides. Here, we synergistically combine solitons and collinear pumping in weakly scattering dye-doped nematic liquid crystals, whereby random lasing and self-confinement concur to beaming the emission, with several improved features: all-optical switching driven by a low-power input, laser directionality and smooth output profile with high-conversion efficiency, externally controlled angular steering. Such effects make soliton-assisted random lasers an outstanding route towards application-oriented random lasers.

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Citations

Sep 29, 2018·Materials·Urszula A LaudynGaetano Assanto
Apr 1, 2020·Optics Express·Ula A LaudynGaetano Assanto
Jan 16, 2019·Optics Letters·Urszula A LaudynGaetano Assanto
Jul 16, 2019·Optics Letters·Sreekanth PerumbilavilGaetano Assanto
Apr 15, 2020·Optics Letters·Michał KwaśnyUrszula A Laudyn
Aug 11, 2020·ACS Omega·Han-Wen HuYang-Fang Chen

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Methods Mentioned

BETA
light scattering

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