  The generation of chiral laser emission offers promising opportunities for
modern photonic applications and the study of chiral light-mater interactions.
Despite the great process made in recent years, the direct generation of chiral
lasers with controllable chirality remains challenging in a microcavity. This
study reports a strategy to control the emission chirality of
whispering-gallery-mode organic microlasers with topological-structured chiral
liquid crystal droplets. The findings suggest that the topological
transformations in a microdroplet can induce different optical chirality
strength and lasing polarization characteristics. In particular, the role of
optical rotatory power was also investigated under linear and circular
polarized excitation, where a vast lasing intensity difference between
left/right circular polarized excitation was revealed. Theoretical analysis and
simulation were carried out to support the significant findings. This study
provides a facile tool for manipulating chiral laser emissions in microcavity,
giving inspiration for topological-controlled photonics, chiral optical
devices, and chiral molecular detection.
