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Proceedings Article

Novel chirped multilayer quantum-dot lasers

[+] Author Affiliations
G. Lin, C. Y. Chang, W. C. Tseng, C. P. Lee

National Chiao-Tung Univ. (Taiwan)

K. F. Lin, R. Xuan

Industrial Technology Research Institute (Taiwan)

J. Y. Chi

National Dong-Hwa Univ. (Taiwan)

Proc. SPIE 6997, Semiconductor Lasers and Laser Dynamics III, 69970R (May 05, 2008); doi:10.1117/12.781955
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From Conference Volume 6997

  • Semiconductor Lasers and Laser Dynamics III
  • Krassimir P. Panajotov; Marc Sciamanna; Angel A. Valle; Rainer Michalzik
  • Strasbourg, France | April 07, 2008

abstract

Chirped multilayer (N=10) QD lasers with 2-, 3- and 5-layer of longer-, medium-, and shorter-wavelength QD stacks, respectively, were grown in this work. Low threshold current density and high saturated modal gain were achieved in this specially designed QD structure. Empirical gain-current analysis was performed on this chirped multilayer QD structure for the first time. It was consistent with our spectral observations and provided valuable information on carrier recombination in chirped multilayer QD structure. Two novel spectral characteristics were discovered also for the first time. First, simultaneous two-wavelength lasing around threshold was observed under particular gain-loss condition at this specific multilayer structure of QD stacking numbers. Second, at cryogenic temperature, simultaneous two-wavelength lasing emissions switched from longer-wavelength lasing first to shorter-wavelength lasing first with increasing current injection. Non-uniform carrier distribution among chirped multilayer QD structure is evident at low temperature below 200 K from our analysis.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

G. Lin ; C. Y. Chang ; W. C. Tseng ; C. P. Lee ; K. F. Lin, et al.
"Novel chirped multilayer quantum-dot lasers", Proc. SPIE 6997, Semiconductor Lasers and Laser Dynamics III, 69970R (May 05, 2008); doi:10.1117/12.781955; http://dx.doi.org/10.1117/12.781955


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