Al(In)As-(Ga)InAs strain-compensated active regions for injectorless quantum cascade lasers

Gerhard Boehm, Simeon Katz, Ralf Meyer, Markus Christian Amann

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We present a new design for quantum cascade lasers (QCLs) without the typically used injector between two consecutive active stages. The lasers are realized with the InP-based material system AlInAs/GaInAs. With additional AlAs and InAs layers a significant optimization of the structure can be realized. In this improved structure the possibility of electrons escaping into the quasi-continuum is drastically reduced by the AlAs-blocking layer. On the other hand, InAs, a material with a very low effective mass, significantly prolongs the carrier lifetime, enhancing the population inversion and increasing the dipole matrix element of the transition. Both inserted layers result in an overall improvement of the device properties, basically the threshold current density (jth), maximum operating temperature (Tmax), output power, slope efficiency and characteristic temperature T0. With high reflection coated facets a record threshold current density as low as 450 A/cm2 at 300 K was achieved in the pulsed mode.

Original languageEnglish
Pages (from-to)1932-1934
Number of pages3
JournalJournal of Crystal Growth
Issue number7
StatePublished - 15 Mar 2009


  • A3. Laser epitaxy
  • B1. Arsenates
  • B1. Phosphides
  • B2. Semiconducting III/V materials
  • B3. Infrared devices
  • B3. Laser diodes


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