Analysis of key parameters affecting the thermal behavior and performance of quantum cascade lasers
In this paper, we present an investigation of some key parameters affecting the thermal behavior and performance of quantum cascade lasers (QCLs). We take into account the temperature dependent heat conducting parameters of the layers, including their interface thermal resistance. Our study shows th...
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Veröffentlicht in: | Journal of applied physics 2006-09, Vol.100 (5) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In this paper, we present an investigation of some key parameters affecting the thermal behavior and performance of quantum cascade lasers (QCLs). We take into account the temperature dependent heat conducting parameters of the layers, including their interface thermal resistance. Our study shows that for QCL structures with a rather thick active core comprised of many heterointerfaces, the thermal boundary resistances play a crucial role. We use a finite element method to simulate the heat dissipation in QCLs with different structures and different packaging methods. These are then quantitatively compared with existing experimental data. Results show that (1) epilayer-up mounting with buried and/or thick gold plated structures is a good substitute for epilayer-down mounting, and (2) using InP cladding and plasmon layer replacing InAlAs∕InGaAs further improves heat transfer characteristics. On the other hand, for reaching cw operation at room temperature, the driving current density must be optimized to a significantly lower level than what is conventionally believed. The simulations also reveal that the substantial nonuniformity of temperature distribution in the active core of QCLs should have a significant effect on the resulting laser spectra. In this paper, we also present investigations and discussions on the thermal performance of InGaAs∕AlGaAsSb QCLs and its correlations to various parameters. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.2344812 |