Preparation method of rare-earth-doped yttrium oxide laser ceramic optical fiber

The present invention discloses a preparation method of rare-earth-doped yttrium oxide laser ceramic optical fiber, and aims to provide a preparation method of rare-earth-doped yttrium oxide laser ceramic optical fiber with high density and good mechanical properties. The preparation method is as follows: high purity rare-earth-doped yttrium oxide nano powder is sieved and selected; a composite sintering additive, a monomer, a crosslinking agent, a dispersing agent and deionized water are added into the selected yttrium oxide powder for ball-mill mixing for preparation of slurry; bubbles in the slurry are removed, an initiator is added, the slurry is injected into a microporous plaster mold for solidification and mold release to obtain a fiber wet blank, and the fiber wet blank is dried and calcined; the fiber blank is sintered in two steps by hydrogen; and sintered ceramic fiber is annealed in oxygen to obtain the rare-earth-doped yttrium oxide laser ceramic optical fiber. Compared with the prior art, the pr