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A simple all fiber passive mode-locked thulium-doped fiber (TDF) linear cavity laser operating at 1901.6nm with an incorporation of homemade graphene oxide paper (GOP) based saturable absorber is proposed and practically demonstrated. The TDF linear cavity laser generates mode-locking pulse at a threshold pump power of 540mW. By varying the pump power from the threshold power to 1052mW, pulse repetition...
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