The effect of hydrostatic pressure on the operation of quantum cascade lasers
Adams, AR, Marko, IP, Sweeney, SJ, Teissier, R, Baranov, AN and Tomić, S (2009) The effect of hydrostatic pressure on the operation of quantum cascade lasers In: Quantum Sensing and Nanophotonic Devices VI, 2009-01-25 - 2009-01-28, San Jose, USA.
The effect of hydrostatic pressure on the operation of quantum cascade lasers.pdf
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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.
|Item Type:||Conference or Workshop Item (Conference Paper)|
|Divisions :||Faculty of Engineering and Physical Sciences > Physics|
|Identification Number :||https://doi.org/10.1117/12.814322|
|Additional Information :||Copyright 2009 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.|
|Depositing User :||Symplectic Elements|
|Date Deposited :||14 Dec 2012 06:20|
|Last Modified :||23 Sep 2013 19:47|
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