| Autor: |
Lü, X, Röben, B, Biermann, K, Wubs, J R, Macherius, U, Weltmann, K-D, van Helden, J H, Schrottke, L, Grahn, H T |
| Předmět: |
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| Zdroj: |
Semiconductor Science & Technology; Mar2023, Vol. 38 Issue 3, p1-6, 6p |
| Abstrakt: |
We report on terahertz (THz) quantum-cascade lasers (QCLs) based on GaAs/AlAs heterostructures, which exhibit single-mode emission at 3.360, 3.921, and 4.745 THz. These frequencies are in close correspondence to fine-structure transitions of Al atoms, N+ ions, and O atoms, respectively. Due to the low electrical pump power of these THz QCLs, they can be operated in a mechanical cryocooler in continuous-wave mode, while a sufficient intrinsic tuning range of more than 5 GHz is maintained. The single-mode operation and the intrinsic tuning range of these THz QCLs allow for the application of these lasers as radiation sources for high-resolution absorption spectroscopy to determine the absolute densities of Al atoms, N+ ions, and O atoms in plasmas. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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