The linewidth enhancement factor of intersubband lasers: from a two-level limit to gain without inversion conditions

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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Link to published version:: 10.1063/1.4969069

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: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1063/1.4969069
Depositing User: Mauro Pereira
Date Deposited: 17 Nov 2016 15:32
Last Modified: 21 Nov 2017 17:13
URI: http://shura.shu.ac.uk/id/eprint/14023

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