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The maximum operating temperature of previously reported terahertz quantum-cascade lasers (QCLs) has empirically been limited to a value of ∼̃/kB. Here, we report a new design scheme for terahertz QCLs and achieve 163-K operation for a 1∶8-THz QCL, which is a factor of 1.9 larger than ̃/kB.

Operation of a 1:8-THz Quantum-Cascade Laser Above 160 K