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A microcavity laser is reported using dye-doped cholesteric liquid crystals (CLCs) filled in a glass capillary with photo-alignment polyimide films. This laser runs based on the properties that a CLC has a refractive index much higher than that of glass, so whispering-gallery-mode (WGM) laser and distributed-feedback-mode lasers are included in the emission spectrum. We obtain a low threshold energy of 4.5 &#x03BC;J &#x00B7; pulse<sup>-1</sup> &#x00B7; mm<sup>-2</sup>, establish the shift of 3.04 nm of the WGMs in the temperature range 43-48 &#x00B0;C, and investigate electric field tunability.

Reduced-Threshold Emission of Capillary Filled by Doped-Dye Cholesteric Liquid Crystals With Photo-Alignment Polyimide Films