Recent progress on rare earth amplifiers and lasers directly on siliconJonathan D. B. Bradley, Khadijeh Miarabbas Kiani, Henry C. Frankis, Cameron M. Naraine, Dawson B. Bonneville, Hamidu M. Mbonde and Andrew P. KnightsEPJ Web Conf., 267 (2022) 02041DOI: https://doi.org/10.1051/epjconf/202226702041