Electrically controllable random lasing from dye-doped nematic liquid crystals within a capillary fiber

Through applied voltage (VAC), the characteristic of dye-doped liquid crystal random lasers (DDLC-RLs) inside capillary fiber (CF) has been readily and efficiently modulated. As VAC rose, the intensity of the emission spike increased dramatically at a fixed excited energy, and the slope efficiency of DDLC-RL increased obviously. By means of the white light scattering spectrum, the increase in the output from DDLC-RL is attributed to the enhancement of recurrent light scattering within the liquid crystals (LCs) to strengthen the light localization. In order to distinguish the characteristic of DDLC-RL with VAC = 0 V and 60 V, the α-stable distribution was adopted to show the Levy distribution of intensity fluctuation with a reduction in value from α = 1.86 to α = 1.59.