Lasing in Three Layer Systems Consisting of Cholesteric Liquid Crystals and Dye Solution
Lasing in Three Layer Systems Consisting of Cholesteric Liquid Crystals and Dye Solution
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DOI：
10.1080/15421400802430521
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发表时间：
2008-01-01
影响因子：
0.7
通讯作者：
Matranga, M. A.
中科院分区：
文献类型：
--
作者：
Chilaya, G.;Chanishvili, A.;Matranga, M. A.
我们研究了多层膜系统中的缺陷模激光。由夹在两个双折射液晶（CLC）单元之间的掺杂染料的各向同性溶剂组成。在这种情况下，我们可以使用不溶于液晶的染料，并避免由泵浦能量的吸收引起的CLC结构的退化。当两个单元的CLC节距相等时，染料发射在光子阻带内产生典型的多模激射峰。在CLC混合物中，其节距以仅CLC层的带隙边缘重叠的方式彼此移位，我们观察到单模激光。激光束斑的发散度显著低于在染料掺杂的CLC中观察到的发散度。
We have investigated defect mode lasing in a multilayer system. consisting of a dye doped isotropic solvent sandwiched between two cholesteric liquid crystal (CLC) cells. In this case we can use dyes not soluble in liquid crystals and avoid the degradation of the CLC structure caused by the absorption of the pumping energy. When the CLC pitches of both cells are equal, the dye emission generates the typical multi-mode lasing peaks inside the photonic stop band. In CLC mixtures whose pitches were shifted one respect to the other in such a way that only the edges of band gaps of the CLC layers overlapped, we have observed single mode lasing. The divergence of the laser beam spot is considerably lower than the one observed in dye doped CLC.