Broad gain injectorless quantum-cascade lasers with low threshold emitting around 8.6 μm

Hua Li, Simeon Katz, Gerhard Boehm, Markus Christian Amann

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Broad gain lasers attract much interest due to the practical gas sensing applications. A step well structure with double optical transitions is implemented in the active region of injectorless quantum-cascade lasers (QCLs) to achieve extended gain bandwidth. The step well is constructed by a "short period superlattice" which provides an equivalent GaInAlAs alloy quantum step well in each active module. The fabricated devices show an ultrabroadband gain spectrum of 480 cm-1 (4 μm) at room temperature in pulsed mode. The laser threshold current density is as low as 1.1 kA/cm2 which is the lowest among the broad gain QCLs emitting at similar wavelengths and the slope efficiency is 1.6 W/A at room temperature.

Original languageEnglish
Title of host publicationAsia Communications and Photonics Conference and Exhibition, ACP 2011
PublisherOptical Society of America (OSA)
ISBN (Electronic)9780819489579
DOIs
StatePublished - 13 Nov 2011

Publication series

NameAsia Communications and Photonics Conference and Exhibition, ACP 2011

Keywords

  • Gain bandwidth
  • Injectorless
  • Mid-infrared
  • Quantum-cascade laser

Fingerprint

Dive into the research topics of 'Broad gain injectorless quantum-cascade lasers with low threshold emitting around 8.6 μm'. Together they form a unique fingerprint.

Cite this