title: Circularly polarized unidirectional lasing from a cholesteric liquid crystal layer on a 1-D photonic crystal substrate.
abstract: We present the results of a study of highly circularly polarized unidirectional lasing emission from an organic lasing device that consisted of a dye-doped cholesteric liquid crystal (CLC) layer on a 1-dimensional (1-D) photonic crystal (PC) reflecting mirror substrate. Unidirectional lasing was demonstrated successfully for this device structure at the wavelength of the high-energy band edge of the CLC layer. It was also shown that circularly polarized lasing emission was produced from the lasing device at a low lasing threshold of 2.5 mJ/pulse. The handedness of lasing light corresponds to the handedness of the used CLC layer with a high ratio of intensity between right- and left-handed circularly polarized lasing light over of up to 3.7. These results show that the CLC / 1-D PC device enables unidirectional lasing with highly circularly polarized laser emission..
authors: Department of Electrophysics, Kwangwoon Univ., Wolgye-Dong, Nowon-gu, Seoul 139-701, Korea. bcpark@kw.ac.kr
authors: Byoungchoo
authors: B
authors: Park
authors: Mina
authors: M
authors: Kim
authors: Sun Woong
authors: SW
authors: Kim
authors: In Tae
authors: IT
authors: Kim
mesh_terms: D002784:Cholesterol / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D004867:Equipment Design; D021621:Imaging, Three-Dimensional; D007834:Lasers; D008027:Light; D050866:Liquid Crystals / Q000737:chemistry*; D055095:Optics and Photonics; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D019265:Spectroscopy, Near-Infrared / Q000379:methods
chemical_list: D004396:Coloring Agents; D002784:Cholesterol