Now showing items 1-3 of 3

    • Low-threshold terahertz quantum-cascade lasers with one-well injector operating up to 174 K 

      Kumar, Sushil; Hu, Qing; Reno, John L. (Institute of Electrical and Electronics Engineers, 2009-08)
      We report operation of v ~ 2.7 THz quantum-cascade lasers (QCLs) up to 174 K. A new three-well active region, one-well injector scheme is utilized to lower the operating current densities. While the temperature performance ...
    • Mode-locking via active gain modulation in quantum cascade lasers 

      Gkortsas, Vasileios-Marios; Kaertner, Franz X.; Kuznetsova, Lyuba; Wang, C. Y.; Diehl, L.; e.a. (Institute of Electrical and Electronics Engineers, 2009-06)
      A mode-locking mechanism by active gain modulation is studied numerically and experimentally. The parameter window for the emission of stable pulse trains was found. Pulses as short as 3 ps (~0.5 pJ) were characterized by ...
    • Spatial hole burning in actively mode-locked quantum cascade lasers 

      Kaertner, Franz X.; Capasso, Federico; Gordon, Ariel; Gkortsas, Vasileios-Marios; Wang, C.; e.a. (Institute of Electrical and Electronics Engineers, 2009-08)
      A theoretical study of active mode-locking in quantum cascade lasers including spatial hole-burning is presented. It is found that spatial hole-burning reduces the pulse duration at the expense of slight pulse instability ...