Title :
Excited-State-Mediated Capture of Carriers Into the Ground State and the Saturation of Optical Power in Quantum-Dot Lasers
Author :
Jiang, Li ; Asryan, Levon V.
Author_Institution :
Virginia Polytech. Inst. & State Univ., Blacksburg, VA
Abstract :
Excited-state-mediated capture of carriers from the waveguide into the lasing ground-state in quantum dots (QDs) is studied. Such a two-step capture places a fundamental limitation on ground-state lasing-the output power saturates at high injection currents. The saturation power is controlled by the transition time between the excited- and ground-state in a QD. The longest, cut-off transition time exists, beyond which no ground-state lasing is possible
Keywords :
excited states; ground states; optical saturation; optical waveguides; quantum dot lasers; carrier capture; cut-off transition time; excited state; excited-state-mediated capture; ground state; ground-state lasing; injection currents; optical power saturation; quantum-dot lasers; Equations; Laser beam cutting; Laser excitation; Laser theory; Laser transitions; Optical saturation; Optical waveguides; Quantum dot lasers; Semiconductor lasers; Stationary state; Quantum-dot (QD) lasers; semiconductor lasers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2006.887353
