Quantum-cascade lasers for terahertz high-resolution spectroscopy

We have developed terahertz (THz) quantum-cascade lasers (QCLs) based on GaAs/AlAs heterostructures for the application-defined emission frequencies of 3.36, 3.92, and 4.75 THz, which correspond to fine-structure transitions of Al atoms, N + ions, and O atoms, respectively. These THz QCLs can be ope...

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Bibliographic Details
Published in2023 48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) pp. 1 - 2
Main Authors Lu, X., Roben, B., Biermann, K., Schrottke, L., Wubs, J. R., Macherius, U., Weltmann, K.-D., van Helden, J. H., Grahn, H. T.
Format Conference Proceeding
LanguageEnglish
Published IEEE 17.09.2023
Subjects
Instruments
Ions
Laser modes
Laser tuning
Local oscillators
Plasmas
Spectroscopy
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Summary:We have developed terahertz (THz) quantum-cascade lasers (QCLs) based on GaAs/AlAs heterostructures for the application-defined emission frequencies of 3.36, 3.92, and 4.75 THz, which correspond to fine-structure transitions of Al atoms, N + ions, and O atoms, respectively. These THz QCLs can be operated in a mechanical cryocooler in continuous-wave mode, while a sufficient intrinsic tuning range of more than 5 GHz is maintained. This allows them to be implemented as local oscillators in airborne astronomical instruments and as radiation sources for high-resolution absorption spectroscopy to determine absolute densities of atoms and ions in plasmas.
ISSN:2162-2035
DOI:10.1109/IRMMW-THz57677.2023.10299335