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We propose a Watt-level, all-fiber, ultrafast Er/Yb-codoped double-clad fiberlaser passively mode-locked by reduced graphene oxide (rGO) interacting with aweak evanescent field of photonic crystal fiber (PCF). The rGO solution isfilled into the cladding holes of the PCF based on total reflection, and afterevaporation, the rGO flakes bear only 1/107 of the total energy in lasersystem, which enhances the thermal damage threshold and decreases theaccumulated nonlinearity. By incorporating the saturable absorber into anEr/Yb-codoped fiber ring cavity, stable conventional soliton with a duration of573 fs is generated, and a average output power up to 1.14 W is obtained.

Watt-level, all-fiber, ultrafast Er/Yb-codoped double-clad fiber laser  mode-locked by reduced graphene oxide interacting with a weak evanescent  field