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Thermally tunable quantum cascade laser with an external germanium-on-SOI distributed bragg reflector

: Radosavljevic, Sanja; Radosavljević, Ana; Schilling, Christian; Hugger, Stefan; Ostendorf, R.; Kuyken, Bart; Roelkens, Gunther


IEEE Journal of Selected Topics in Quantum Electronics 25 (2019), Nr.6, Art. 1200407, 7 S.
ISSN: 1077-260X
Fraunhofer IAF ()
quantum cascade laser; distributed Bragg reflector; Germanium-on-SOI; mid-infrared

Quantum cascade lasers (QCLs) are essential components for mid-infrared optical spectroscopy. Currently, widely tunable QCLs are using an external diffraction grating to tune the laser wavelength. In this paper we present a compact tunable QCL that is thermally tuned by a distributed Bragg reflector (DBR) implemented on a Germanium-on-SOI (Ge-on-SOI) waveguide circuit. The 5.1x μm wavelength laser, operating in pulsed mode at room temperature, is continuously tuned over 50 nm.