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首页> 外文期刊>Optics Letters >Continuous wave mirrorless lasing in cholesteric liquid crystals with a pitch gradient across the cell gap
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Continuous wave mirrorless lasing in cholesteric liquid crystals with a pitch gradient across the cell gap

机译:胆甾醇型液晶中的连续波无反射镜激光发射,其跨细胞间隙的间距梯度

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摘要

Despite numerous efforts, continuous wave (CW) lasing in dye doped, one-dimensional (1D) photonic bandgap cholesteric liquid crystal (CLC) structures has not been previously reported, to our knowledge. Here we report on the observation of lasing in such structures under both coherent (laser) and incoherent (LED) CW light excitation. To achieve this effect, we used a 1D-photonic bandgap structure made of a polymer stabilized CLC with a pitch gradient across the cell thickness. A spectral reflectivity profile of such a CLC structure reveals local minima in the area within a photonic stopband and close to it. The realization of lasing pumped by low power CW light sources opens the possibility of all-organic, compact, tunable CW lasers for display and medical applications.
机译:尽管进行了许多努力,据我们所知,以前尚未报道过染料掺杂的一维(1D)光子带隙胆甾型液晶(CLC)结构中的连续波(CW)激射。在这里,我们报告了在相干(激光)和不相干(LED)CW光激发下在此类结构中产生激光的观察结果。为了实现这一效果,我们使用了由聚合物稳定的CLC制成的一维光子带隙结构,该结构具有跨整个单元厚度的间距梯度。这种CLC结构的光谱反射率曲线揭示了在光子阻带内及其附近的区域中的局部最小值。低功率连续波光源泵浦激射的实现为显示器和医疗应用提供了全有机,紧凑,可调谐连续波激光器的可能性。

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