title: Quantum cascade lasers designed toward shorter wavelengths.
abstract: Quantum cascade lasers (QCLs) are normally based on one-dimensional confined quantum wells. In this scheme, it is still a challenge to produce lasing with a frequency higher than mid-infrared. Here, we discuss the possibility to extend the spectral range of QCLs to the higher frequency region by adding another dimensional confinement. Taking the ZnO/MgO system as an example, we demonstrate theoretically that such a two-dimensional confined QCL can operate at wavelengths from the near-infrared [Formula: see text] μm, 1.57 μm, 1.13 μm to the visible 734 nm.
authors.affiliation: State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, No.3888 Dongnanhu Road, Changchun 130033, People's Republic of China. University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
authors.forename: Jilian
authors.initials: J
authors.lastname: Xu
authors.forename: Lei
authors.initials: L
authors.lastname: Liu
authors.forename: Bing Hui
authors.initials: BH
authors.lastname: Li
authors.forename: Zhenzhong
authors.initials: Z
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Ma
authors.forename: Kewei
authors.initials: K
authors.lastname: Liu
authors.forename: Jun
authors.initials: J
authors.lastname: He
authors.forename: D Z
authors.initials: DZ
authors.lastname: Shen