Chiroptical Properties Induced in Chiral Photonic‐Bandgap Liquid Crystals Leading to a Highly Efficient Laser‐Feedback Effect

Abstract

Highly efficient lasing action is obtained by exploiting the chiroptical characteristics of the ground and excited states of an achiral fluorescent dye doped in a cholesteric liquid crystal (CLC) medium (see figure). The highly efficient lasing action from the oblique dye-doped CLC cell is produced by tuning the ellipticity angle of the excitation beam while taking into consideration the molecular helical sense of the cholesteric host.