Progress in monolithic, broadband, widely tunable midinfrared quantum cascade lasers

Manijeh Razeghi*, Wenjia Zhou, Ryan Mcclintock, Donghai Wu, Steven Slivken

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We present recent progress on the development of monolithic, broadband, widely tunable midinfrared quantum cascade lasers. First, we show a broadband midinfrared laser gain realized by a heterogeneous quantum cascade laser based on a strain balanced composite well design of Al0.63In0.37As/Ga0.35In0.65As/Ga0.47In0.53As. Single mode emission between 5.9 and 10.9 μm under pulsed mode operation was realized from a distributed feedback laser array, which exhibited a flat current threshold across the spectral range. Using the broadband wafer, a monolithic tuning between 6.2 and 9.1 μm was demonstrated from a beam combined sampled grating distributed feedback laser array. The tunable laser was utilized for a fast sensing of methane under pulsed operation. Transmission spectra were obtained without any moving parts, which showed excellent agreement to a standard measurement made by a Fourier transform infrared spectrometer.

Original languageEnglish (US)
Article number011018
JournalOptical Engineering
Issue number1
StatePublished - Jan 1 2018


  • broadband
  • midinfrared
  • quantum cascade lasers
  • single mode
  • spectroscopy
  • tunable

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)


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