Quantum Cascade Laser

@article{Faist1994QuantumCL,
  title={Quantum Cascade Laser},
  author={J. Faist and F. Capasso and D. Sivco and C. Sirtori and A. L. Hutchinson and A. Cho},
  journal={Science},
  year={1994},
  volume={264},
  pages={553 - 556}
}
A semiconductor injection laser that differs in a fundamental way from diode lasers has been demonstrated. It is built out of quantum semiconductor structures that were grown by molecular beam epitaxy and designed by band structure engineering. Electrons streaming down a potential staircase sequentially emit photons at the steps. The steps consist of coupled quantum wells in which population inversion between discrete conduction band excited states is achieved by control of tunneling. A strong… Expand

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      The modern double-heterostructure injection laser was demonstrated by