Ning Zhuo, Fengqi Liu, Zhanguo Wang. Quantum cascade lasers: from sketch to mainstream in the mid and far infrared[J]. Journal of Semiconductors, 2020, 41(1): 010301
- Journal of Semiconductors
- Vol. 41, Issue 1, 010301 (2020)
Fig. 1. (Color online) (a) Basic four-level system for intersubband lasers and (b) fast LO-phonon scattering process between and in subbands.
Fig. 2. (Color online) (a) Typical mid infrared QCL structure and (b) subband diagram of gain region under applied electric field.
![(Color online) Representative evolution roadmaps for (a) multi quantum wells design (Refs. [2, 5, 8]) and (b) superlattice design (Refs. [3, 6, 11]).](/Images/icon/loading.gif){kind=icon}
Fig. 3. (Color online) Representative evolution roadmaps for (a) multi quantum wells design (Refs. [2 , 5 , 8 ]) and (b) superlattice design (Refs. [3 , 6 , 11 ]).
Fig. 4. (Color online) Schematic of (a) a quantum dot cascade laser and (b) energy band structures of quantum wells and quantum dots-based active region.
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