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Proceedings Paper

Negative differential gain in 1.3um quantum dot lasers: comparison of self-heating and free carrier effects
Author(s): H. Shahid; D. T. D. Childs; B. J. Stevens; R. A. Hogg
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Paper Abstract

A comparative study of the gain spectra of quantum-dot lasers at high carrier densities is reported. The gain spectra of quantum dot lasers under a constant junction temperature (obtained by the use of Fabry-Perot modes as a temperature gauge) and under constant heat-sink temperatures are measured. Negative differential gain, observed for the ensemble of quantum dot ground-states is shown to be mainly due to free carrier effects, where increasing dephasing effects, combined with saturated gain, result in spectral broadening and a reduction in the peak gain.

Paper Details

Date Published: 28 February 2012
PDF: 7 pages
Proc. SPIE 8255, Physics and Simulation of Optoelectronic Devices XX, 82550B (28 February 2012); doi: 10.1117/12.907103
Show Author Affiliations
H. Shahid, The Univ. of Sheffield (United Kingdom)
D. T. D. Childs, The Univ. of Sheffield (United Kingdom)
B. J. Stevens, The Univ. of Sheffield (United Kingdom)
R. A. Hogg, The Univ. of Sheffield (United Kingdom)


Published in SPIE Proceedings Vol. 8255:
Physics and Simulation of Optoelectronic Devices XX
Bernd Witzigmann; Marek Osinski; Fritz Henneberger; Yasuhiko Arakawa, Editor(s)

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