基于羧基氧化石墨烯的调Q光纤激光器
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摘要
由于羧基官能团在碳原子层内以及边缘处的大量分布,羧基氧化石墨烯(Carboxyl-functionalized graphene oxide,GO-COOH)具有比石墨烯及氧化石墨烯更强的水溶性和生物活性,而且羧基氧化石墨烯的制备方法更加灵活、简单,使其在可饱和吸收体领域表现出一定的应用优势.将二维材料GO-COOH与聚合物聚乙烯醇(PVA)混合制成饱和吸收体薄膜,在掺铒光纤激光器中实现了稳定的调Q运转.泵浦功率为11-45mW时,激光器可以在12.05-22.52kHz重复频率范围内进行调谐,调Q脉冲的脉冲宽度的可调谐范围为19.81-4.66μs.当泵浦功率为45mW时,得到最小调Q脉冲宽度为4.66μs,最大单脉冲能量为117.68nJ.实验结果表明,羧基氧化石墨烯是一种有着广泛应用前景的二维非线性光学材料.
Due to the large distribution of carboxyl functional groups within the carbon atom layer and at the edges,Carboxyl-functionalized graphene oxide(GO-COOH)has stronger water solubility and biological activity than graphene and graphene oxide.In addition,the fabrication method of GO-COOH is more flexible.So it has potential advantages in the field of wideband saturated absorbers.Using the GO-COOH acts as a saturable absorber(SA)in Er-doped fiber(EDF)laser cavity,we obtain the Q-switching operation.The GO-COOH SA is prepared by mixing the GO-COOH nanosheets with PVA.By incorporating the GO-COOH/PVA film into EDF laser cavity,stable Q-switched pulses are generated.The shortest pulse duration is 4.66μs,and the maximum single pulse energy is 117.68 nJ.The experimental results evidently show that the GO-COOH possesses the potential in photonics applications.
Due to the large distribution of carboxyl functional groups within the carbon atom layer and at the edges,Carboxyl-functionalized graphene oxide(GO-COOH)has stronger water solubility and biological activity than graphene and graphene oxide.In addition,the fabrication method of GO-COOH is more flexible.So it has potential advantages in the field of wideband saturated absorbers.Using the GO-COOH acts as a saturable absorber(SA)in Er-doped fiber(EDF)laser cavity,we obtain the Q-switching operation.The GO-COOH SA is prepared by mixing the GO-COOH nanosheets with PVA.By incorporating the GO-COOH/PVA film into EDF laser cavity,stable Q-switched pulses are generated.The shortest pulse duration is 4.66μs,and the maximum single pulse energy is 117.68 nJ.The experimental results evidently show that the GO-COOH possesses the potential in photonics applications.
引文
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[6]马志军,魏荣妃,胡忠亮,等.2D材料和准2D材料的非线性光学特性及应用[J].中国激光,2017,44(7):0703002.
[7]Bao Q,Zhang H,Wang Y,et al.Atomic-layer graphene as a saturable absorber for ultrafast pulsed lasers[J].Adv Func Mater,2009,19:3077-3083.
[8]Luo Z Q,Wang J Z,Zhou M,et al.Multiwavelength mode-locked erbium-doped fiber laser based on the interaction of Graphene and fiber taper evanescent field[J].Laser Phys Lett,2012,9:229-233.
[9]金雨,杜林,蒋保国,等.基于碲化铋纳米片的全光可控调Q光纤激光器[J].中国激光,2017,44(7):0703014.
[10]Guo B,Yao Y,Yang Y F.Dual-wavelength rectangular pulse erbium-doped fiber laser based on topological insulator saturable absorber[J].Photon Res,2015,3:94-99.
[11]Liu W J,Liu M L,Yin J D,et al.Tungsten diselenide for all-fiber lasers with the chemical vapor deposition method[J].Nanoscale,2018,10(17):7971-7977.
[12]Liu W J,Liu M L,OuYang Y Y,et al.Tungsten diselenide for mode-locked erbium-doped fiber lasers with short pulse duration[J].Nanotechnology,2018,29(17):174002.
[13]Kong L,Qin Z,Xie G,et al.Black phosphorus as broadband saturable absorber for pulsed lasers from 1mto 2.7μm wavelength[J].Laser Phys Lett,2016,13:045801.
[14]Guo B,Wang S H,Wu Z X,et al.Sub-200fs soliton mode-locked fiber laser based on bismuthene saturable absorber[J].Opt Express,2018,26(18):22750-22760.
[15]Tan W D,Su C Y,Knize R J,et al.Mode locking of ceramic Nd:yttrium aluminum garnet with graphene as a saturable absorber[J].Appl Phys Lett,2010,96(3):031106.
[16]Cizmeciyan M N,Kim J W,Bae S,et al.Graphene mode-locked femtosecond Cr:ZnSe laser at 2500nm[J].Opt let,2013,38(3):341-343.
[17]Boguslawski J,Sotor J,Sobon G,et al.Graphene oxide paper as a saturable absorber for Er-and Tm-doped fiber lasers[J].Photon Res,2015,3(4):119-124.
[18]Lv R D,Li L,Wang Y Y,et al.Carboxyl graphene oxide solution saturable absorber for femtosecond mode-locked erbium-doped fiber laser[J].Chin Phys B,2018,27(11):114214.
[19]Zhao F Y,Wang Y S,Wang Y Y,et al.Graphene oxide-COOH as a new saturable absorber for both Q-switching and mode-locking fiber lasers[J].Chin Opt Lett,2017,15(10):101402.