In this study, ZBYA glass is prepared and tested and its better thermal and chemical stabilities are demonstrated. Accordingly, we fabricate the Ho³⁺ -doped ZBYA glass fiber and achieve a ~2.9-μm laser. The maximum output power is 137 mW, and the slope efficiency is 8.9%. Currently, the background of fiber is still high owing to the purity of raw materials; however, by optimizing the preparation process to reduce fiber loss, it is expected to achieve higher output power and slope efficiency. Furthermore, silica fiber and ZBYA fiber’s fusion splicing technology should be investigated to reduce the complexity of laser systems. The future work should focus on the preparation of double-cladding fibers to increase the maximum pump power and obtain higher power output.