Photonics Research, 2020, 8 (5): 05000642, Published Online: Apr. 17, 2020   

Low threshold random lasing in dye-doped and strongly disordered chiral liquid crystals Download: 745次

Author Affiliations
1 The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China
2 Institute of Optoelectronic Engineering, College of Physics & Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China
3 Synergetic Innovation Center of Chemical Science and Engineering, Tianjin 300071, China
4 Institute of Physics, National Academy of Sciences of Ukraine, Prospect Nauki 46, Kiev 03028, Ukraine
5 Faculty of Mathematics and Physics, University of Ljubljana and Department of Complex Matter, J. Stefan Institute, Ljubljana, Slovenia
6 Faculty of Physics, Vienna University, Boltzmanngasse 5, A-1090 Wien, Austria
7 e-mail: zxz@nankai.edu.cn
8 e-mail: lgtc@iop.kiev.ua
9 e-mail: jjxu@nankai.edu.cn
Abstract
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.

Shaohua Gao, Jiayi Wang, Wenhua Li, Xuanyi Yu, Xinzheng Zhang, Xiao Song, Andrey Iljin, Irena Drevensek-Olenik, Romano A. Rupp, Jingjun Xu. Low threshold random lasing in dye-doped and strongly disordered chiral liquid crystals[J]. Photonics Research, 2020, 8(5): 05000642.

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