期刊
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
卷 10, 期 2, 页码 133-140出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2019.2957456
关键词
Quantum cascade lasers; Laser transitions; Surface emitting lasers; Spectroscopy; Tuning; Laser modes; Scattering; Quantum-cascade laser (QCLs); terahertz (THz) spectroscopy
资金
- Leibniz-Gemeinschaft [K54/2017]
- European Space Agency [D/973/67268909, 4000125911/18/NL/AF]
We have developed terahertz (THz) quantum-cascade lasers (QCLs) based on GaAs/AlAs heterostructures for application-defined emission frequencies between 3.4 and 5.0 THz. Due to their narrow line width and rather large intrinsic tuning range, these THz QCLs can be used as local oscillators in airborne or satellite-based astronomical instruments or as radiation sources for high-resolution absorption spectroscopy, which is expected to allow for a quantitative determination of the density of atoms and ions in plasma processes. The GaAs/AlAs THz QCLs can be operated in mechanical cryocoolers and even in miniature cryocoolers due to the comparatively high wall-plug efficiency of around 0.2% and typical current densities below 500 A/cm$<<^>>2$. These lasers emit output powers of more than 1 mW at operating temperatures up to about 70 K, which is sufficient for most of the abovementioned applications.
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