Xiao Yi-Xin, Zhu Tian-Xiang, Liang Peng-Jun, Wang Yi-Yang, Zhou Zong-Quan, Li Chuan-Feng. Optical and hyperfine spectroscopic investigations on europium ions doped in yttrium orthosilicate waveguides fabricated by focused ion beam millingJ. Acta Physica Sinica, 2024, 73(22): 220303. DOI: 10.7498/aps.73.20241070