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Time-resolved amplified spontaneous emission in quantum dots

Gomis-Bresco, Jordi; Dommers-Völkel, Sabine; Schöps, Oliver; Kaptan, Yücel; Dyatlova, O.; Bimberg, Dieter; Woggon, Ulrike

In time-resolved experiments at InGaAs/GaAs quantum-dots-in-a-well (DWELL) semiconductor optical amplifiers, pump-probe of the ground state (GS) population, and complementary measurement of the amplified spontaneous emission of the excited state (ES) population, we are able to separate the early subpicosecond dephasing dynamics from the later picosecond population relaxation dynamics. We observe a 10 ps delay between the nonlinear GS pulse amplification and the subsequent ES population drop-off that supports the dominance of a direct two dimensional reservoir-GS capture relaxation path in electrically pumped quantum-dot-DWELL structures.
Published in: Applied Physics Letters, 10.1063/1.3529447, American Institute of Physics (AIP)
  • This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 97, 251106 (2010) and may be found at