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.

[img]
Preview
PDF (Published can be added after a 12 month embargo)
Pereiera - Linewidth enhancement factor of intersubband lasers.pdf - Published Version
All rights reserved.

Download (452kB) | Preview
[img]
Preview
PDF (Image 2)
Pereiera - Linewidth enhancement factor of intersubband lasers ( image2).pdf - Supplemental Material
All rights reserved.

Download (45kB) | Preview
[img]
Preview
PDF (Image 3)
Pereiera - Linewidth enhancement factor of intersubband lasers ( image3).pdf - Supplemental Material
All rights reserved.

Download (45kB) | Preview
[img]
Preview
PDF (Image 4)
Pereiera - Linewidth enhancement factor of intersubband lasers ( image4).pdf - Supplemental Material
All rights reserved.

Download (31kB) | Preview
Link to published version:: https://doi.org/10.1063/1.4969069
Related URLs:

    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 > Thin Films 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: 08 Jul 2019 14:50
    URI: http://shura.shu.ac.uk/id/eprint/14023

    Actions (login required)

    View Item View Item

    Downloads

    Downloads per month over past year

    View more statistics