Static and dynamic measurements of the α-factor of five-quantum-dot-layer single-mode lasers emitting at 1.3 μm on GaAs

Martinez, A.; Lemaître, A.; Merghem, K.; Ferlazzo, L.; Dupuis, C.; Ramdane, A.; Provost, J.-G.; Dagens, B.; Le Gouezigou, O.; Gauthier-Lafaye, O.
May 2005
Applied Physics Letters;5/23/2005, Vol. 86 Issue 21, p211115
Academic Journal
The “material” and “device” linewidth enhancement factor α of five-quantum-dot (QD)-layer single-mode lasers emitting at 1.3 μm are investigated using two methods. The Hakki–Paoli method associated with pulsed analysis of Fabry–Perot modes below threshold demonstrates a record value of 0.7 at 1295 nm. High-frequency current modulation experiments showed a value of 2.0 just above threshold at 1.3 μm with a steady increase with the current. Dynamic measurements on a three-QD layer device, with a reduced ground state optical gain, showed a similar increase of α with current but at a higher rate.


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