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    • 2. 发明公开
    • Electrically switchable optical grating having DFB laser properties, a DFB laser containing same, and a production method therefor
    • 电可切换光学光栅DFB激光器的特性,这种全面DFB激光器,及其制造方法
    • EP2187254A1
    • 2010-05-19
    • EP08169354.1
    • 2008-11-18
    • Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
    • Sakhno, OksanaStumpe, JoachimSchrader, SigurdKsianzou, Viachaslau
    • G02F1/1334H01S3/063H01S3/213
    • G02F1/13342G02F1/13762G02F2201/305G02F2201/346H01S3/1686
    • The present invention is directed to a structure, having first areas consisting of or comprising a network of organic polymer material and second areas consisting of a nematic and/or smectic liquid crystal material, comprising at least one or more nematic and/or smectic liquid crystals and a photoluminescent material, wherein the first and second areas alternate in at least a first plane, while the composition of the film is substantially invariable in at least one direction which is angular to the said first plane, or second areas are completely surrounded by first areas, and the said areas are located in a periodic pattern, wherein the nematic and/or smectic liquid crystal material in the second areas extends in the longitudinal direction of the said areas from one end of the area to the other, the structure being arranged between two substrates, at least one of which is light transmitting. The structure together with the substrates may be a Bragg grating and can be used as a DFB laser. It can be prepared by providing a homogeneous and isotropic mixture including a photocurable monomer/oligomer, a nematic and/or smectic liquid crystal, and a photoluminescent material, filling said mixture into the space between two substrates and irradiating same with a light field such that areas of the mixture are irradiated while others are not. Under the irradiation, the mixture separates into areas comprising photocured polymer and areas consisting or comprising liquid crystals and photoluminescent material.
    • 本发明涉及一种结构,其具有第一区域组成或包含有机聚合物材料和第二区域组成的向列型和/或近晶相液晶材料的一个网络,包括至少一个或更多个向列型和/或近晶状液晶 和光致发光材料,worin所述第一和第二区域交替地切换在至少一个第一平面上,而该膜的组合物是在至少一个方向上的所有其角与所述第一平面基本上不变,或第二区域完全呼叫由第一包围 区域,并且所述区域是位于周期性图案,worin在第二区域的向列型和/或近晶相液晶材料的所述区域的从区域到另一个的一端的纵向方向延伸,所述结构被布置 之间的两个基板,所有这是光发射的至少一个。 与基板一起的结构可以是一个布喇格光栅,并且可以被用作DFB激光器。 它可以通过确实提供均匀的和各向同性的混合物,包括可光固化的单体/低聚物,向列型和/或近晶相液晶,和光致发光材料,所述混合物填充到空间之间的两个基板和照射相同与光场调查来制备 混合物的区域进行照射,而有些则没有。 下照射,将混合物分离成包含光固化的聚合物区和区域由或包括液晶和光致发光材料。