8.7-W average power femtosecond Ho:CALGO bulk laser at 2.1 μmWeichao Yao, Yicheng Wang, Sergei Tomilov, Shahwar Ahmed, Christoph Liebald, Daniel Rytz, Mark Peltz, Volker Wesemann and Clara J. SaracenoEPJ Web Conf., 267 (2022) 01054DOI: https://doi.org/10.1051/epjconf/202226701054