Journal
PHOTONICS
Volume 9, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/photonics9100747
Keywords
quantum cascade lasers; mid-infrared lasers
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Funding
- French Program Investment for the Future (Equipex EXTRA) [ANR-11-EQPX-0016]
- H2020 program of the European Union (OPTAPHI) [GA 860808]
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In this study, InAs-based quantum cascade lasers (QCLs) operating near 14 μm were reported to have a threshold current density J(th) as low as 0.6 kA/cm(2) at room temperature. The achieved threshold was lower than that of the best reported InP-based QCLs without facet treatment, partially due to an increased separation between the upper transition level and the next one in the active quantum wells of the QCL design employed.
We report InAs-based quantum cascade lasers (QCLs) operating near 14 mu m with a threshold current density J(th) as low as 0.6 kA/cm(2) at room temperature. The threshold obtained is lower than the J(th) of the best reported InP-based QCLs to date without facet treatment. The achieved performance improvement is partially due to an increased separation between the upper transition level and the next one in the active quantum wells of the employed QCL design.
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