Direct measurement of an ultrafast sub-bandwidth-limited signal in mid-infrared quantum cascade lasersBarbara Schneider, Alexander Dikopoldsev, Philipp Täschler, Filippos Kapsalidis, Mattias Beck and Jérôme FaistEPJ Web Conf., 287 (2023) 07027DOI: https://doi.org/10.1051/epjconf/202328707027