Stability of quantum-dot excited-state laser emission under simultaneous ground-state perturbation

Journal Article · Mon Nov 10 04:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4901051· OSTI ID:22391925

Herzog, B.; Schöps, O.; Kolarczik, M.; Woggon, U.; Owschimikow, N. ^[1]; Röhm, A.; Lingnau, B.; Lüdge, K. ^[2]; Schmeckebier, H.; Arsenijević, D.; Bimberg, D. ^[3]; Mikhelashvili, V.; Eisenstein, G. ^[4]

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1. Institut für Optik und Atomare Physik, Technische Universität Berlin, Berlin (Germany)
2. Institut für Theoretische Physik, Technische Universität Berlin, Berlin (Germany)
3. Institut für Festkörperphysik, Technische Universität Berlin, Berlin (Germany)
4. Technion Institute of Technology, Faculty of Electrical Engineering, Haifa (Israel)

The impact of ground state amplification on the laser emission of In(Ga)As quantum dot excited state lasers is studied in time-resolved experiments. We find that a depopulation of the quantum dot ground state is followed by a drop in excited state lasing intensity. The magnitude of the drop is strongly dependent on the wavelength of the depletion pulse and the applied injection current. Numerical simulations based on laser rate equations reproduce the experimental results and explain the wavelength dependence by the different dynamics in lasing and non-lasing sub-ensembles within the inhomogeneously broadened quantum dots. At high injection levels, the observed response even upon perturbation of the lasing sub-ensemble is small and followed by a fast recovery, thus supporting the capacity of fast modulation in dual-state devices.

• OSTI ID: 22391925
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 19 Vol. 105; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPUTERIZED SIMULATION
EXCITED STATES
GALLIUM ARSENIDES
GROUND STATES
INDIUM ARSENIDES
LASERS
QUANTUM DOTS
REACTION KINETICS
TIME RESOLUTION