title: Continuous spatial tuning of laser emissions with tuning resolution less than 1 nm in a wedge cell  of dye-doped cholesteric liquid crystals.
abstract: We report the design and fabrication of a wedge structured CLC film incorporating a spatial gradient of a chiral dopant concentration. A continuous spatial laser tuning in the broad visible spectral range with tuning resolution less than 1 nm is demonstrated, which renders a CLC-based micron-sized laser an important continuously tunable laser device.
authors.affiliation: Department of Physics and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, Korea. jmy97@gnu.ac.kr
authors.forename: Mi-Yun
authors.initials: MY
authors.lastname: Jeong
authors.forename: J W
authors.initials: JW
authors.lastname: Wu