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Effect of an excited-state optical transition on the linewidth enhancement factor of quantum dot lasers
- Source :
- Semiconductors. 46:225-230
- Publication Year :
- 2012
- Publisher :
- Pleiades Publishing Ltd, 2012.
-
Abstract
- An analytical expression is derived for the linewidth enhancement factor of a quantum-dot laser, which makes it possible to describe its dependence on optical loss and photon density in an explicit form. The model accounts for refractive index variations at the ground-state optical transition due to gain/absorption variations upon the first excited-state transition in quantum dots. It is shown that a decrease in optical loss, an increase in saturated gain, and an increase in the energy separation between the excited-state and ground-state transitions results in a decrease in the α factor both at and above the lasing threshold.
- Subjects :
- Condensed matter physics
Chemistry
Physics::Optics
Condensed Matter Physics
Laser
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
law.invention
Laser linewidth
law
Quantum dot
Quantum dot laser
Excited state
Atomic physics
Absorption (electromagnetic radiation)
Refractive index
Lasing threshold
Subjects
Details
- ISSN :
- 10906479 and 10637826
- Volume :
- 46
- Database :
- OpenAIRE
- Journal :
- Semiconductors
- Accession number :
- edsair.doi...........92b331f3bc88023ce5ce7c05c1505a7d