摘要
Here,we investigated the nonlinear optical(NLO)characteristics of carboxyl-functionalized graphene oxide(GO-COOH)in the near-infrared(NIR)region.The results revealed that GO-COOH samples exhibit strong saturable absorption at low pump levels and a gradual transition to reverse saturable absorption(RSA)with increasing pump power.Then the saturable absorber(SA)by depositing the GO-COOH on the side-polished fiber(SPF)was employed in Yb-and Er-doped fiber lasers.Stable ultrashort pulses operating in the dissipative soliton(DS)and conventional soliton(CS)regimes were obtained with pulse widths of 26.6 ps and 968 fs,respectively.Besides,the dissipative soliton resonance(DSR)phenomenon caused by the RSA of GO-COOH was also observed with increasing pump power.The high-stable DSR mode-locked pulses with the maximum pulse energy of 1.91 nJ and 0.74 nJ were obtained in YDFL and EDFL respectively.These results not only reveal the potentiality of GO-COOH in ultrafast photonics applications but also open a new avenue to explore high-pulse-energy laser sources based on twodimensional materials.
基金
the National Natural Science Foundation of China(12174223,12274263,12004213,21872084,52072351,62175128)
the Natural Science Foundation of Shandong Province(ZR2022QF063)
the China Postdoctoral Science Foundation(2022M711936)
the Postdoctoral Innovation Project of Shandong Province(Grant No.SDCX-ZG-202201006)
the Qingdao Postdoctoral Application Research Funded Project.H.Chu and Z.Pan thank Shandong University for financial support.
