Generation of 60 fs pulses at 780 nm by frequency doubling of Er-doped fiber laser with tunable repetition rate for TPEF imagingD. Stachowiak, J. Bogusławski, A. Głuszek, A. Hudzikowski, Z. Łaszczych, M. Wojtkowski and G. SobońEPJ Web Conf., 243 (2020) 15002DOI: https://doi.org/10.1051/epjconf/202024315002