Multi-μJ 12 μm Femtosecond GaSe-based OPCPA at 1 kHz Repetition RatePia Fuertjes, Martin Bock, Lorenz von Grafenstein, Uwe Griebner and Thomas ElsaesserEPJ Web Conf., 267 (2022) 01022DOI: https://doi.org/10.1051/epjconf/202226701022