Comparison of linewidth enhancement factors in midinfrared active region materials

Autor:	J. T. Olesberg, Michael E. Flatté, Thomas F. Boggess
Rok vydání:	2000
Předmět:	Materials science Condensed matter physics business.industry Superlattice General Physics and Astronomy Thermal conduction Reduction (complexity) Laser linewidth Dispersion (optics) Optoelectronics Absorption (electromagnetic radiation) business Conduction band Quantum well
Zdroj:	Journal of Applied Physics. 87:7164-7168
ISSN:	1089-7550 0021-8979
Popis:	We report calculations of the linewidth enhancement factor for five midinfrared active region materials. The linewidth enhancement factors for two type-I quantum wells based on InAsSb are 2.5 and 5.4, which represent a reduction of up to a factor of 2.6 with respect to bulk InAs0.91Sb0.09. However, active region materials based on the type-II, InAs/GaInSb system have linewidth enhancement factors near 1.0, which is a factor of 2–5 reduction compared to the type-I quantum wells. The reduction of the linewidth enhancement factor is associated with both a reduction of the mismatch between the conduction and valence band densities of states and the presence of conduction band dispersion. We describe an additional optimization that is possible in the type-II materials: Carefully placed intersubband absorption features can be used to further reduce the linewidth enhancement factor. We show that linewidth enhancement values as low as 0.3 can be obtained in the type-II superlattices when fabricated into a distrib...
Databáze:	OpenAIRE
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