ABSTRACT
The influence of the pump laser beam on the lasing spectral characteristics in dye-doped cholesteric liquid crystal is investigated. Under the influence of the pump laser pulses with different repetition rates and energies, non-linear reorientation and light-induced flow reorientation of chiral nematic liquid crystals (CLC) molecules was observed. Independent of the reorientation mechanism, multi-wavelength lasing was achieved due to stepwise uncoiling of the CLC structure. Under the influence of a pump laser beam with low repetition rate, Cano–Grandjean disclination defect lines were induced which remain even after removal of the laser beam.
Graphical Abstract
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Acknowledgements
This work was partially supported by the RA MES State Committee of Science in the frames of the research project no. 15T-1C099. The authors would also like to acknowledge the Flemish Fund for Scientific Research (FWO) in the form of a PhD Fellowship grant for I. Nys and the Centre of Nano and Bio Photonics at UGent.
Disclosure statement
No potential conflict of interest was reported by the authors.