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.

Perumbilavil, S., Piccardi, A., Barboza, R., Buchnev, O., Strangi, G., Kauranen, M., et al. (2018). Beaming random lasers with soliton control. NATURE COMMUNICATIONS, 9(1), 3863 [10.1038/s41467-018-06170-9].

Beaming random lasers with soliton control

G. Assanto
Conceptualization
2018-01-01

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.
Perumbilavil, S., Piccardi, A., Barboza, R., Buchnev, O., Strangi, G., Kauranen, M., et al. (2018). Beaming random lasers with soliton control. NATURE COMMUNICATIONS, 9(1), 3863 [10.1038/s41467-018-06170-9].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/341024
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