期刊
PHYSICAL REVIEW E
卷 86, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.86.065201
关键词
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资金
- DFG [Sfb 787]
- US Department of Energy's National Nuclear Security Administration [DE-ACD4-94AL85000]
- Sandia's Solid-State Lighting Science Center, an Energy Frontier Research Center (EFRC)
- US Department of Energy, Office of Science, Office of Basic Energy Sciences
We show that the long-established concept of a linewidth-enhancement factor alpha to describe carrier-induced refractive index changes in semiconductor lasers breaks down in quantum-dot (QD) lasers when describing complex dynamic scenarios, found, for example, under high-excitation or optical injection. By comparing laser simulations using a constant alpha factor with results from a more complex nonequilibrium model that separately treats gain and refractive index dynamics, we examine the conditions under which an approximation of the amplitude-phase coupling by an alpha factor becomes invalid. The investigations show that while a quasiequilibrium approach for conventional quantum well lasers is valid over a reasonable parameter range, allowing one to introduce an alpha factor as a constant parameter, the concept is in general not applicable to predict QD laser dynamics due to the different time scales of the involved scattering processes. DOI: 10.1103/PhysRevE.86.065201
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