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An electrical tuning method for terahertz quantum-cascade lasers (QCLs) is developed based on detuned intersubband absorption in coupled metallic microcavities, which works even at high operating temperatures. Continuous 4 GHz tuning for a single-mode narrow-beam 3.57 THz QCL operating at ∼ 50 K in a Stirling cryocooler is demonstrated.
A broadband bidirectional terahertz quantum-cascade laser operating up to 147K and emitting in the frequency range of 3.1–3.7THz is demonstrated. A three-well GaAs/AlGaAs design with 10%Al barriers is shown to be optimum for bidirectional lasing.
A distributed antenna-coupling scheme for THz quantum cascade lasers is introduced. Single-mode emission in a narrow beam pattern, with an order of magnitude increase in output power is predicted compared to previous distributed-feedback schemes.
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