A　novel　reflective　graphene　oxide　based　saturable　absorber　is　fabricated　and　used　to　passively　mode　locked　the　Nd:YVO4　ultrafast　laser　system.　The　maximum　average　output　power　measured　is　3.06W　and　the　optical　to　optical　conversion　efficiency　is　about　25%.　The　measured　pulse　duration　and　repetition　rate　are　8.8　ps　and　84　MHz.　The　maximum　peak　power　and　the　single　pulse　energy　of　the　mode-locking　laser　are　up　to　4.1　kW　and　36　nJ,　respectively.　To　the　best　of　our　knowledge,　it　is　the　highest　average　output　power　for　the　lasers　mode　locked　with　graphene　based　absorbers.　(C)　2013　Elsevier　B.V.　All　rights　reserved.