The effect of slow passage in the pulse-pumped quantum dot laser


In recent years, quantum-dot (QD) semiconductor lasers attract significant interest in many practical applications due to their advantages such as high-power pulse generation because to the high gain efficiency. In this work, the pulse shape of an electrically pumped QD-laser under high current is analyzed. We find that the slow rise time of the pulsed pump may significantly affect the high intensity output pulse. It results in sharp power dropouts and deformation of the pulse profile. We address the effect to dynamical change of the phase-amplitude coupling in the proximity of the excited state (ES) threshold. Under 30ns pulse pumping, the output pulse shape strongly depends on pumping amplitude. At lower currents, which correspond to lasing in the ground state (GS), the pulse shape mimics that of the pump pulse. However, at higher currents the pulse shape becomes progressively unstable. The instability is greatest when in proximity to the secondary threshold which corresponds to the beginning of the ES lasing. After the slow rise stage, the output power sharply drops out. It is followed by a long-time power-off stage and large-scale amplitude fluctuations. We explain these observations by the dynamical change of the alpha-factor in the QD-laser and reveal the role of the slowly rising pumping processes in the pulse shaping and power dropouts at higher currents. The modeling is in very good agreement with the experimental observations.

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Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Additional Information: G. S. Sokolovskii ; M. Abu Saa ; J. Danckaert ; V. V. Dudelev ; A. G. Deryagin ; I. I. Novikov ; M. V. Maximov ; A. E. Zhukov ; V. M. Ustinov ; V. I. Kuchinskii ; W. Sibbett ; E. U. Rafailov ; E. A. Viktorov and T. Erneux, " The effect of slow passage in the pulse-pumped quantum dot laser ", Proc. SPIE 9134, Semiconductor Lasers and Laser Dynamics VI, 913405 (May 2, 2014). Copyright 2014. Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. DOI:
Event Title: Semiconductor lasers and laser dynamics VI
Event Type: Other
Event Dates: 2014-04-14 - 2014-04-17
Uncontrolled Keywords: quantum dot devices,semiconductor lasers,Applied Mathematics,Computer Science Applications,Electrical and Electronic Engineering,Electronic, Optical and Magnetic Materials,Condensed Matter Physics
ISBN: 978-1-628-41082-2
Last Modified: 18 Mar 2024 08:07
Date Deposited: 13 Aug 2015 14:15
Full Text Link: http://proceedi ... ticleid=1868130
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Conference contribution
Published Date: 2014-12
Authors: Sokolovskii, G.S.
Abu Saa, M.
Danckaert, J.
Dudelev, V.V.
Deryagin, A.G.
Novikov, I.I.
Maximov, M.V.
Zhukov, A.E.
Ustinov, V.M.
Kuchinskii, V.I.
Sibbett, W.
Rafailov, E.U. (ORCID Profile 0000-0002-4152-0120)
Viktorov, E.A.
Erneux, T.



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