Abstract
THz quantum-cascade lasers (QCLs) are compact semiconductor sources shown to emit over an octave in spectral bandwidth in CW operation [1]. The generation of frequency combs by THz QCLs, based on their internal four-wave mixing featuring narrow beatnotes, was shown and verified for various structures [1,2,4]. The emission over a large spectral range can be achieved by either optimizing the gain and its dispersion [1], cavity mode controlling [3] or compensating the material dispersion by designing a negative cavity dispersion [3]. The wide bandwidth is in general reached by stacking multiple active region (AR) designs to a so called heterogeneous structure featuring a broad gain.
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