Abstract
We demonstrate dispersion compensation in mid-infrared quantum cascade laser frequency combs (FCs) emitting at 7.8 μm using the coupling of a dielectric waveguide to a plasmonic resonance in the top cladding layer of the latter. Devices with group velocity dispersion lower than were fabricated, and narrow beatnotes with FWHM linewidths below 1 kHz were measured on the entire operation range. At , the optical output power reaches 275 mW, and the optical spectrum spans . The multi-heterodyne beating spectrum of two devices was measured and spans , demonstrating the potential of dispersion-engineered waveguides for the fabrication of highly stable and reliable quantum cascade laser FCs with high output power across the mid-infrared.
© 2017 Optical Society of America
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