▎ 摘　　要

NOVELTY - The method involves performing ultrasonic dispersion of graphene in water or organic solvent at centrifugal speed of 2000-10000 rotation/min by utilizing sodium acid dispersant, where the graphene is one of single layer graphene, graphite alkene or multi-layer graphene. Supernatant glass fluid and partially crystalline glass or quartz are added to a surface of the water or solvent to obtain a saturated absorber. The organic solvent is selected from one of chloroform, methanol, ethanol, acetone, acetonitrile or cyclohexane. USE - Method for producing a saturable absorber that is utilized in ultrashort pulse field. ADVANTAGE - The method enables production of saturable absorber by utilizing graphene as a saturable absorption body in a convenient and cost-effective manner. The method enables production of a saturable absorber that operates under a wide range of wavelength. DESCRIPTION OF DRAWING(S) - The drawing shows a photograph illustrating a saturable absorber preparation method.