InAs/AlSb widely tunable external cavity quantum cascade laser around 3.2 μm

T. Kruczek, K.A. Fedorova, G.S. Sokolovskii, R. Teissier, A.N. Baranov, E.U. Rafailov

Research output: Contribution to journalArticlepeer-review


Room temperature, tunable, external-cavity short-wavelength InAs/AlSb quantum cascade laser (QCL) is reported. Wavelength tuning of 85 nm for the spectral range between 3190 nm and 3275 nm has been achieved by rotating the diffraction grating forming the external cavity. To suppress lasing inside the QCL cavity, its ridge was tilted by 7° at the external cavity end. The optimal tilting angle of the laser ridge was chosen by careful consideration of the return losses of the TM-polarized waveguide mode from the diffraction grating in a quasi-Littrow configuration and the Fabry-Pérot feedback from the tilted laser facet. No antireflection coating was used.
Original languageEnglish
Article number011124
Number of pages3
JournalApplied Physics Letters
Publication statusPublished - 7 Jan 2013


  • tunable laser
  • quantum cascade laser


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