Coherent walk and lock in driven fast-gain frequency-combs Ina Heckelmann, Mathieu Bertrand, Alexander Dikopoltsev, Giacomo Scalari, Mattias Beck and Jérôme Faist EPJ Web Conf., 287 (2023) 07021 Published online: 18 October 2023 DOI: 10.1051/epjconf/202328707021