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• W4313469673 abstract "Broadband emission in the terahertz spectral region is a prerequisite for applications such as spectroscopy or white light sources. Appropriate signal powers and a compact design are advantageous for this use. A technology which meets these requirements are terahertz quantum cascade lasers. These electrically pumped, on-chip semiconductor lasers provide high output powers and the freedom of tailoring their emission wavelength by bandstructure engineering. By combining multiple active region designs emitting at different wavelengths in a single structure, one can obtain broadband emission from a single device. Here, we present a heterogeneous terahertz quantum cascade laser consisting of five individual active regions based on a three-well, LO-phonon depopulation design. The devices lase in pulsed and continuous-wave operation and emit in a spectral range from 1.9 to 4.5 THz, covering a bandwidth of 1.37 octaves. The use of the three-well design, which was optimized for high temperature operation, leads to a maximum operating temperature in the pulsed operation of 143 K." @default.
• W4313469673 created "2023-01-06" @default.
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• W4313469673 date "2022-12-21" @default.
• W4313469673 modified "2023-10-17" @default.
• W4313469673 title "Ultrabroadband Heterogeneous THz Quantum Cascade Laser" @default.
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• W4313469673 doi "https://doi.org/10.1021/acsphotonics.2c01202" @default.
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• W4313469673 hasPublicationYear "2022" @default.
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