Calculation of optical gain in AlGaN quantum wells for ultraviolet emission
| Autor: | Bernd Witzigmann, Friedhard Römer, Martin Martens, Christian Kuhn, Tim Wernicke, Michael Kneissl |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Born approximation
superlattices Maxwell-Bloch equations Übergitter Maxwell-Bloch-Gleichungen semiconductors lcsh:QC1-999 laser theory quantum wells Partielle Differentialgleichung Quantenwell Born-Näherung renormalization and regularization Halbleiter partial differential equations lcsh:Physics Bandstruktur electronic bandstructure |
| Zdroj: | AIP Advances, Vol 10, Iss 9, Pp 095307-095307-5 (2020) |
| DOI: | 10.17170/kobra-202010011870 |
| Popis: | Stimulated emission from AlGaN based quantum wells (QWs) emitting at ultraviolet wavelengths is investigated theoretically. Maxwell–Bloch equations in the second Born approximation are solved self-consistently with the Poisson equation. The valence band dispersion is obtained from a 6-band kp-model. For a QW emitting at around 270 nm with a thickness of 2.2 nm, an estimated FWHM of 10 meV for homogeneous broadening and an excitonic red shift of 100 meV are extracted under typical laser conditions. From a comparison to experimental data of stimulated emission, an inhomogeneous broadening energy of 39 meV FWHM is evaluated. Calculations show that high TE gain can be achieved for thin QWs around 2 nm thickness in a multiple QW arrangement or for single QWs thicker than 6 nm. |
| Databáze: | OpenAIRE |
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