Scollo, R. (2006). Two-state switching and dynamics in quantum dot two-section lasers. Journal of Applied Physics, 100 (11) Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publicationGeneral rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement: www.tue.nl/taverne Take down policyIf you believe that this document breaches copyright please contact us at:openaccess@tue.nl providing details and we will investigate your claim. The electrical control of the lasing wavelength in two-section quantum dot lasers is investigated. By changing the optical loss in the absorber section, the control of the ground-state ͑GS͒ and excited-state ͑ES͒ lasing thresholds and output powers is achieved. Additionally, a complex self-pulsation dynamics with simultaneous oscillations of the GS and ES intensities is observed. The experimental results are well explained in the framework of a rate equation model.

The effect of thermal hopping and homogeneous broadening on the lasing spectra and carrier distribution in quantum dot lasers is investigated by measuring the spontaneous emission spectra through a top-contact window. Two intriguing features are observed, i.e., a strong redshift of the excited-state lasing peak as compared to the spontaneous emission spectrum and the absence of population clamping at threshold. These features are interpreted on the basis of a rate-equation model taking into account energy-broadening mechanisms and thermal coupling among quantum dots. The good agreement between model and experiment allows us to estimate the homogeneous broadening and capture time, two key parameters for the understanding and proper design of quantum dot lasers.