Serrodyne optical frequency shifting using a nonlinear multi-pass cell Henrik Tünnermann, Balla Prannay, Sarper H. Salman, Mingqi Fan, Skirmantas Alisauskas, Ingmar Hartl and Christoph M. Heyl EPJ Web Conf., 267 (2022) 02036 Published online: 18 October 2022 DOI: 10.1051/epjconf/202226702036