▎ 摘　　要

NOVELTY - The absorber has an upper substrate material provided with a bottom layer that is coated with substrate material graphene. A sandwich structure is provided with a coated layer. The substrate material is uniformly coated with periphery sealing glue. The substrate material is selected from quartz and sapphire or glass transparent material. USE - Sandwich graphene saturable absorber. ADVANTAGE - The absorber avoids occurrence of graphene oxidation reaction with oxygen during laser irradiation and improves output power of laser pulse. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a sandwich graphene saturable absorber preparation method. DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a sandwich graphene saturable absorber.