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FERNANDES PEREIRA, Mauro (2016). The linewidth enhancement factor of intersubband lasers: from a two-level limit to gain without inversion conditions. Applied Physics Letters, 109 (22), p. 222102.
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Abstract
The linewidth enhancement (α factor) due to fluctuations in the refractive index induced by carrier fluctuations of intersubband lasers was initially expected to be zero. However, values ranging from -0.5 to 3 have been found experimentally. This paper resolves this controversy showing that counter rotating terms, usually ignored in simulations are the actual fundamental origin of nonzero α at peak gain even without inclusion of nonparabolicity and manybody effects, which are however needed to explain negative values. For laser without inversion conditions, significant as a potential out of the box solution for the elusive room temperature operation of terahertz lasers, α is found to be larger, but still at the same order of magnitude of conventional inverted medium lasers, thus ensuring their applicability to a huge number of spectroscopic applications which require sharp laser linewidths.
| Item Type: | Article |
|---|---|
| Additional Information: | AIP ID: 049648APL |
| Research Institute, Centre or Group - Does NOT include content added after October 2018: | Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Electronic Materials and Sensors Research Group |
| Identification Number: | https://doi.org/10.1063/1.4969069 |
| Page Range: | p. 222102 |
| Depositing User: | Mauro Pereira |
| Date Deposited: | 17 Nov 2016 15:32 |
| Last Modified: | 18 Mar 2021 04:57 |
| URI: | https://shura.shu.ac.uk/id/eprint/14023 |
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