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Transmission and emission spectra of the pre-emulsified dye-doped chiral nematic mixture, indicating dye absorbance around 532 nm and the long band-edge coinciding with the fluorescence gain maximum.
Deswelling of LC emulsion films forms oblate LC droplets. Small droplets give rise to nonresonant random lasing (a) while large droplets form a Grandjean alignment suitable for band-edge lasing (c). Polarized microscopy images of the droplets are shown in (b) and (d).
Emission spectra for broad linewidth random lasing from small droplets (a) and narrow linewidth band-edge lasing from large droplets (b). Insets show Lorentzian and Gaussian fitting, respectively. Lasing thresholds are shown in (c) and (d).
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