Low-Loss Coupling of Quantum Cascade Lasers into Hollow-Core Waveguides with Single-Mode Output in the 3.7-7.6 μm Spectral Range. - Pietro Patimisco; Angelo Sampaolo; Laura Mihai; Marilena Giglio; Jason Kriesel; Dan Sporea; Gaetano Scamarcio; Frank K. Tittel; Vincenzo Spagnolo (Sensors, 2016)