Abstract
AbstractWe have observed mirrorless lasing in dye‐doped and pure cholesteric liquid crystals. The periodic structure and large birefringence gives rise to photonic band‐gap behavior in these materials. We have studied the effects of this band‐gap structure on the fluorescence spectrum of dyes dissolved in the cholesteric liquid crystal as well as on the emission characteristics of the liquid crystal itself. Enhancement of fluorescence at the band edges, and, above a certain pump threshold, lasing both in dye‐doped and in pure liquid crystals was observed. Extremely low lasing thresholds and high efficiencies were obtained in dye‐doped systems. Experimental results suggest an active energy transfer mechanism between the LC host and the fluorescent dye molecules.
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