▎ 摘　　要

NOVELTY - The utility model claims an X cavity mode-locked all-solid-state laser based on graphene oxide saturable absorber, comprising a semiconductor tail fibre laser, the semiconductor tail fibre laser generates continuous light, the continuous light passes through the coupling lens group, the first plano-concave mirror, Nd: YAG crystal, the second plano-concave mirror; reflector, then continuous light returns along the original path to enhance under the reflection action of the reflector, and then reflected to the graphene oxide saturable absorber and output mirror through the first plano-concave mirror, wherein the first plano-concave mirror, Nd: YAG crystal, the second plano-concave mirror, reflector; the graphene oxide saturable absorber and the output mirror form an X-type resonant cavity; The laser forms an X type resonant cavity through the spatial layout; the continuous light is increased and reflected to enhance the link; the output mode locking pulse laser light intensity is more stable; the new saturable absorber is used; the preparation method is simple and the cost is low; it can realize femtosecond pulse laser output of picosecond level.