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Proceedings Paper

The effect of hydrostatic pressure on the operation of quantum cascade lasers
Author(s): Alfred R. Adams; Igor P. Marko; Stephen J. Sweeney; Roland Teissier; Alexei N. Baranov; Stanko Tomić
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Paper Abstract

Quantum Cascade Lasers (QCLs) have been very successful at long wavelengths, >4μm, and there is now considerable effort to develop QCLs for short wavelength (2-3μm) applications. To optimise both interband and QC lasers it is important to understand the role of radiative and non-radiative processes and their variation with wavelength and temperature. We use high hydrostatic pressure to manipulate the band structure of lasers to identify the dominant efficiency limiting processes. We describe how hydrostatic pressure may also be used to vary the separation between the Γ, Χ and L bands, allowing one to investigate the role of inter-valley carrier scattering on the properties of QCLs. We will describe an example of how pressure can be used to investigate the properties of 2.9-3.3μm InAs/AlSb QCLs. We find that while the threshold current of the 3.3μm devices shows little pressure variation even at room temperature, for the 2.9μm devices the threshold current increases by ~20% over 4kbar at 190K consistent with carrier scattering into the L-minima. Based on our high pressure studies, we conclude that the maximum operating temperature of InAs/AlSb QCLs decreases with decreasing wavelength due to increased carrier scattering into the L-minima of InAs.

Paper Details

Date Published: 26 January 2009
PDF: 6 pages
Proc. SPIE 7222, Quantum Sensing and Nanophotonic Devices VI, 722203 (26 January 2009); doi: 10.1117/12.814322
Show Author Affiliations
Alfred R. Adams, Univ. of Surrey (United Kingdom)
Igor P. Marko, Univ. of Surrey (United Kingdom)
Stephen J. Sweeney, Univ. of Surrey (United Kingdom)
Roland Teissier, Institut d’Électronique du Sud, Univ. Montpellier II, CNRS (France)
Alexei N. Baranov, Institut d’Électronique du Sud, Univ. Montpellier II, CNRS (France)
Stanko Tomić, STFC Daresbury Lab. (United Kingdom)


Published in SPIE Proceedings Vol. 7222:
Quantum Sensing and Nanophotonic Devices VI
Manijeh Razeghi; Rengarajan Sudharsanan; Gail J. Brown, Editor(s)

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