Beaming random lasers with soliton control

Sreekanth Perumbilavil, Armando Piccardi, Raouf Barboza, Oleksandr Buchnev, Martti Kauranen, Giuseppe Strangi and Gaetano Assanto ()
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Sreekanth Perumbilavil: Tampere University of Technology
Armando Piccardi: NooEL—Nonlinear Optics and OptoElectronics Lab, University ”Roma Tre”
Raouf Barboza: Tampere University of Technology
Oleksandr Buchnev: University of Southampton
Martti Kauranen: Tampere University of Technology
Giuseppe Strangi: Case Western Reserve University
Gaetano Assanto: Tampere University of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-06170-9

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