title: Indirect pump scheme for quantum cascade lasers: dynamics of electron-transport and very high T0-values.
abstract: An alternative pump scheme, named indirect pump one is proposed to clarify its own feasibility. The high device performances of 8 microm quantum cascade lasers with cavity lengths of 4 mm and 1.5 mm are demonstrated: low threshold current densities of 2.7 and 3.3 kA/cm2 and maximum output powers of 362 and 50 mW at room temperature, and high T0-values of 243 and 303 K around room temperature. The higher T0-value, 303 K is the highest record ever reported with quantum cascade lasers. The high stability for temperature changes is interpreted in terms of the indirect pumping model.
authors.affiliation: Central Research Laboratories, HAMAMATSU PHOTONICS K.K., Hamakita-ku, Hamamatsu, 434-8601 Japan. masamiya@crl.hpk.co.jp
authors.forename: Masamichi
authors.initials: M
authors.lastname: Yamanishi
authors.forename: Kazuue
authors.initials: K
authors.lastname: Fujita
authors.forename: Tadataka
authors.initials: T
authors.lastname: Edamura
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Kan
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004579:Electron Transport; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007259:Infrared Rays; D054023:Lasers, Semiconductor; D008027:Light; D008962:Models, Theoretical; D012542:Scattering, Radiation; D013696:Temperature