Beaming random lasers with soliton control
Perumbilavil, Sreekanth; Piccardi, Armando; Barboza, Raouf; Buchnev, Oleksandr; Kauranen, Martti; Strangi, Giuseppe; Assanto, Gaetano (2018-12-01)
Perumbilavil, Sreekanth
Piccardi, Armando
Barboza, Raouf
Buchnev, Oleksandr
Kauranen, Martti
Strangi, Giuseppe
Assanto, Gaetano
01.12.2018
3863
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201810262477
https://urn.fi/URN:NBN:fi:tty-201810262477
Kuvaus
Peer reviewed
Tiivistelmä
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.
Kokoelmat
- TUNICRIS-julkaisut [17109]