Characterization of the THz quantum cascade laser using fast superconducting hot electron bolometer Yu.V. Lobanov, Yu.B. Vakhtomin, I.V. Pentin, R.A. Khabibullin, N.V. Shchavruk and K. V. Smirnov EPJ Web Conf., 195 (2018) 04004 Published online: 23 November 2018 DOI: 10.1051/epjconf/201819504004