High-power portable terahertz laser systems

By A. Khalatpour, A. Paulsen, C. Deimert, Z. Wasilewski, Q. Hu. 2020

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Terahertz Band Communication: An Old Problem Revisited and Research Directions for the Next Decade (2021, background): “While output powers of up to a few hundreds of mWs have been demonstrated at cryogenic temperatures, the open challenge is to ensure practical power ﬁgures when operating at room temperature [50], [51].”
The 2023 terahertz science and technology roadmap (2023, background): “Here sophisticated band structure engineering of GaAs-based quantum wells has enabled the centre wavelength of these THz lasers to be tailored flexibly, simultaneously enabling output powers of several watts [125], large gain bandwidths facilitating frequency comb (FC) operation [126] and ultrashort”
Quantum technology for military applications (2021, background): “However, recent development allows chip-level implementation working at around –23◦C, which can be achieved by a portable cooling system [149].”