File:Cascade transitions.svg
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Original file (SVG file, nominally 361 × 248 pixels, file size: 50 KB)
Summary
| Description | Intersubband optical transitions within a quantum cascade structure. Electrons emit a photon as they transfer to a lower energy level. The electron tunnels to the next period of the structure and the process repeats. Real quantum cascade devices are more complex than this structure, as they may employ several quantum wells in each period. In a quantum cascade laser, population inversion may be achieved by "draining" electrons from the lower laser state by non-radiative scattering. |
| Date | |
| Source | Self-made in inkscape |
| Author | Alexander Valavanis, University of Leeds |
Licensing
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:33, 29 August 2007 | | 361 × 248 (50 KB) | wikimediacommons>Papa November | Trimmed edges |
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