High performance monolithic, broadly tunable mid-infrared quantum cascade lasers

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

*Corresponding author for this work

Research output: Contribution to journalLetter

19 Scopus citations

Abstract

Mid-infrared lasers, emitting in the spectral region of 3-12 μm that contains strong characteristic vibrational transitions of many important molecules, are highly desirable for spectroscopy sensing applications. High-efficiency quantum cascade lasers have been demonstrated with up to watt-level output power in the mid-infrared region. However, the wide wavelength tuning that is critical for spectroscopy applications still largely relies on incorporating external gratings, which have stability issues. Here, we demonstrate a monolithic, broadly tunable quantum cascade laser source emitting between 6.1 and 9.2 μm through an on-chip integration of a sampled grating distributed feedback tunable laser array and a beam combiner. High peak power up to 65 mW has been obtained through a balanced high-gain active region design, efficient waveguide layout, and the development of a broadband antireflection coating. Nearly fundamental transversemode operation is achieved for all emission wavelengths with a pointing stability better than 1.6 mrad (0.1°). The demonstrated laser source opens new opportunities for mid-infrared spectroscopy.

Original languageEnglish (US)
Article number294708
Pages (from-to)1228-1231
Number of pages4
JournalOptica
Volume4
Issue number10
DOIs
StatePublished - Oct 20 2017

ASJC Scopus subject areas

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

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