Random lasing in dye-doped chiral nematic liquid crystal

Random lasing in dye-doped chiral nematic liquid crystal
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染料掺杂手性向列液晶中的随机激光

DOI:
10.1016/j.ijleo.2019.163616
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发表时间:
2020-02
期刊:
影响因子:
3.1
通讯作者:
Qin Dai
Qin Dai
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Rina Wu;Jiaqi Lu;Xing Wang;Fan Yang;Yeqiu Li;Qin Dai

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在 PM597 染料掺杂手性向列液晶 (DDLCC) 单元中观察到随机激光作用。无需摩擦处理即可在单元中获得具有许多微域的手性向列液晶(CLC)的焦点圆锥结构。采用波长为532nm的Nd:YAG脉冲固体激光器作为泵浦源。获得了线宽为0.3nm、波长范围为570-590nm的离散、锐利的随机激光。随机激光的泵浦阈值能量很大程度上取决于细胞厚度。厚度为80μm的DDCLC细胞显示出最低阈值Ethof 7.6μJ,而10μm DDCLC细胞显示出最高Ethof为19.6μJ。较低的 Eth 归因于更密集的微域分布,在一定的泵浦深度下提供更强的光子散射。当温度达到 61°C 时,随机激光发射关闭。
Random laser action is observed in the PM597 dye-doped chiral nematic liquid crystal (DDCLC) cells. A focal conic texture of chiral nematic liquid crystal (CLC) with many micro-domains is achieved in the cell without rubbing treatment. An Nd:YAG pulsed solid-state laser with a wavelength of 532 nm is employed as a pump source. Discrete and sharp random lasers with a line-width of 0.3 nm and wavelength range of 570–590 nm are obtained. The pump threshold energy of a random laser significantly depends on the cell thickness. The DDCLC cell with a thickness of 80 μm shows the lowest threshold value Ethof 7.6μJ, whereas the 10 μm DDCLC cell presents the highest Eth of 19.6μJ. The lower Eth is attributed to a denser micro-domain distribution that provides a stronger photon scattering at a certain pump depth. The random laser emission is shut down when the temperature reaches 61 °C.
DOI: 10.1016/j.optcom.2013.03.031
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影响因子: 2.4
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