High-performance quantum cascade lasers with electric-field-free undoped superlattice

Alessandro Tredicucci, Federico Capasso, Claire Gmachl, Deborah L. Sivco, Albert L. Hutchinson, Alfred Y. Cho

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


An optimized design of quantum cascade lasers with electric field free undoped superlattice active regions is presented. In these structures the superlattice is engineered so that: 1) the first two extended states of the upper miniband are separated by an optical phonon to avoid phonon bottleneck effects and concentrate the injected electron density in the lower state and 2) the oscillator strength of the laser transition is maximized. The injectors' doping profile is also optimized by concentrating the doping in a single quantum well to reduce the electron density in the active material. These design changes result in major improvements of the pulse/continuous-wave performance such as a weak temperature dependence of threshold (To = 167 K), high peak powers (100-200 mW at 300 K) and higher CW operating temperatures for devices emitting around at λ to approximately 8.5 μm.

Original languageEnglish (US)
Pages (from-to)260-262
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number3
StatePublished - Mar 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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