| Autor: |
Ndebeka-Bandou, C., Rösch, M., Ohtani, K., Beck, M., Faist, J. |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Appl. Phys. Lett. 108, 091102 (2016) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1063/1.4942889 |
| Popis: |
We analyze the peculiar case where the free carrier absorption arising from LO phonon absorption-assisted transitions becomes negative and therefore turns into a gain source for quantum cascade lasers. Such an additional source of gain exists when the ratio between the electronic and the lattice temperatures is larger than one, a condition that is usually fulfilled in quantum cascade lasers. We find a gain of few cm$^{-1}$'s at 200K. We report the development of a terahertz quantum cascade laser operating in the negative free carrier absorption regime. |
| Databáze: |
arXiv |
| Externí odkaz: |
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