Sub-40 fs Kerr-lens mode-locked Tm,Ho:CALGO laser Weidong Chen, Li Wang, Uwe Griebner, Ge Zhang, Pavel Loiko, Xavier Mateos, Ji Eun Bae, Fabian Rotermund, Xiaodong Xu, Arkady Major and Valentin Petrov EPJ Web Conf., 267 (2022) 01025 Published online: 18 October 2022 DOI: 10.1051/epjconf/202226701025