Shortwave quantum cascade laser frequency comb for multi-heterodyne spectroscopy

Q. Y. Lu, S. Manna, D. H. Wu, S. Slivken, M. Razeghi

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Quantum cascade lasers (QCLs) are versatile light sources with tailorable emitting wavelengths covering the mid-infrared and terahertz spectral ranges. When the dispersion is minimized, frequency combs can be directly emitted from quantum cascade lasers via four-wave mixing. To date, most of the mid-infrared quantum cascade laser combs are operational in a narrow wavelength range wherein the QCL dispersion is minimal. In this work, we address the issue of very high dispersion for shortwave QCLs and demonstrate 1-W dispersion compensated shortwave QCL frequency combs at λ ∼ 5.0 μm, spanning a spectral range of 100 cm-1. The multi-heterodyne spectrum exhibits 95 equally spaced frequency comb lines, indicating that the shortwave QCL combs are ideal candidates for high-speed high-resolution spectroscopy.

Original languageEnglish (US)
Article number141104
JournalApplied Physics Letters
Volume112
Issue number14
DOIs
StatePublished - Apr 2 2018

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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