Beaming random lasers with soliton control

S Perumbilavil, A Piccardi, R Barboza… - Nature …, 2018 - nature.com
Nature communications, 2018nature.com
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, ie, light-induced waveguides. Here, we synergistically combine solitons and
collinear pumping in weakly scattering dye-doped nematic liquid crystals, whereby random …
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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