A. Jiang, K. Vijayraghavan, A. Matyas, C. Jirauschek, Z. R. Wasilewski, and M. A. Belkin, "Terahertz Quantum Cascade Laser Performance for Structures with Variable Barrier Heights," in CLEO: 2013, OSA Technical Digest (online) (Optical Society of America, 2013), paper JTu1J.7.
We experimentally studied the performance of GaAs/AlGaAs terahertz quantum cascade lasers with variable barrier heights in the bandstructure. Best devices achieved Tmax close to that of the record structure, while having lower threshold current density.