A Compact 4.75-THz Source Based on a Quantum-Cascade Laser With a Back-Facet Mirror
| Autor: | Xiang Lü, Martin Wienold, Till Hagelschuer, Heinz-Wilhelm Hübers, Holger T. Grahn, Lutz Schrottke, Klaus Biermann, Heiko Richter, Benjamin Röben |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Physics Radiation business.industry Terahertz radiation Local oscillator Superheterodyne receiver 02 engineering and technology space technology Cryocooler terahertz spectroscopy 021001 nanoscience & nanotechnology Laser 01 natural sciences Terahertz spectroscopy and technology law.invention Quantum-cascade laser (QCL) Resonator Optics law 0103 physical sciences Electrical and Electronic Engineering 0210 nano-technology business Quantum cascade laser |
| Zdroj: | IEEE Transactions on Terahertz Science and Technology. 9:606-612 |
| ISSN: | 2156-3446 2156-342X |
| DOI: | 10.1109/tthz.2019.2935337 |
| Popis: | We report on a compact terahertz (THz) source based on a quantum-cascade laser (QCL). The source is intended for a local oscillator in a THz heterodyne receiver for the detection of the fine structure line of neutral atomic oxygen at 4.7448 THz. The laser is mounted in a mechanical cryocooler. Laser operation is realized in continuous-wave mode in the range from −2.7 to +9.4 GHz around the target frequency. Special care has been taken on the laser design, which employs a GaAs/AlAs active region heterostructure and a resonator with an additional back-facet mirror. At a typical QCL operating point ( I = 200 mA, T = 60 K, ν = 4.75 THz, P opt = 5 mW) close to the target frequency, this system with a mass of only 4 kg requires an electrical input power of less than 130 W for a cooling capacity of up to 4 W. The maximum optical output power of the QCL reaches up to 8 mW with an electrical pump power of less than 1.8 W. The application of such a system in a spaceborne mission appears to be feasible. |
| Databáze: | OpenAIRE |
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