Low threshold random lasing in dye-doped and strongly disordered chiral liquid crystals

作     者：SHAOHUA GAO JIAYI WANG WENHUA LI XUANYI YU XINZHENG ZHANG XIAO SONG ANDREY ILJIN IRENA DREVENSEK-OLENIK ROMANO A.RUPP JINGJUN XU 

作者机构：The MOE Key Laboratory of Weak-Light Nonlinear PhotonicsTEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300457China Institu te of Optoelectronic EngineeringCollege of Physics&OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China Synergetic Innovation Center of Chemical Science and EngineeringTianjin 300071China Institute of PhysicsNational Academy of Sciences of UkraineProspect Nauki 46Kiev 03028Ukraine Faculty of Mathematics and PhysicsUniversity of Ljubljana and Department of Complex MatterJ.Stefan InstituteLjubljanaSlovenia Faculty of PhysicsVienna UniversityBoltzmanngasse 5A-1090 WienAustria 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2020年第8卷第5期

页      面：642-647页

核心收录：

学科分类：0808[工学-电气工程] 080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：National Key Research and Development Program of China(2017YFA0303800) National Natural Science Foundation of China(91750204,11674182) 111Project(B07013) Natural Science Foundation of Tianjin City(17JCYBJC16700) Slovenian Research Agency(ARRS,Research Program P1-0192) Project of National Academy of Sciences of Ukraine(0117U002612) Projects of National Academy of Sciences of Ukraine(V-197,VC-202) 

主　　题：lasing random dye 

摘      要：Random lasing was experimentally investigated in pyrromethene 597-doped strongly disordered chiral liquid crystals (CLCs) composed of the nematic liquid crystal SLC1717 and the chiral agent CB15. The concentration of the chiral agent tuned the bandgap, and disordered CLC microdomains were achieved by fast quenching of the mixture from the isotropic to the cholesteric phase. Random lasing and band edge lasing were observed synchronously, and their behavior changed with the spectral location of the bandgap. The emission band for band edge lasing shifted with the change of the bandgap, while the emission band for random lasing remained practically constant. The results show that the threshold for random lasing sharply decreases if the CLC selective reflection band overlaps with the fluorescence peak of the dye molecules and if the band edge coincides at the same time with the excitation wavelength.