Journal
ACS PHOTONICS
Volume 9, Issue 2, Pages 426-431Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.1c01767
Keywords
quantum cascade laser; integrated photonics; frequency comb; mid-infrared; spectroscopy; on-chip sensing
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Funding
- Swiss National Science Foundation [176584]
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In this study, we achieve monolithic integration of mid-infrared lasers and low-loss waveguides, demonstrating continuous-wave lasing at room temperature and paving the way for on-chip mid-infrared dual-comb sensors.
Mid-infrared semiconductor lasers in photonic integrated circuits are of considerable interest for a variety of industrial, environmental, and medical applications. However, photonic integration technologies in the mid-infrared lag far behind the near-infrared range. Here we present the monolithic integration of mid-infrared quantum cascade lasers with low-loss passive waveguides via buttcoupling. The passive waveguide losses are experimentally evaluated to be only 1.2 +/- 0.3 dB/cm, with negligible butt-coupling losses. We demonstrate continuous-wave lasing at room temperature of these active-to-passive waveguide coupled devices. Moreover, we report a frequency comb operation paving the way toward on-chip, midinfrared, dual-comb sensors.
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