Mode-locked 2 μm fiber laser with a multi-walled carbon nanotube as a saturable absorber |
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作者姓名: | S.M.Azooz F.Ahmad H.Ahmad S.W.Harun B.A.Hamida S.Khan A.Halder M.C.Paul M.Pal S.K.Bhadra |
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作者单位: | Department of Electrical Engineering, Faculty of Engineering, University of Malaya;Photonics Research Center, University of Malaya;Department of Electrical and Computer Engineering, International Islamic University Malaysia,Jalan Gombak;Fiber Optics and Photonics Division, Central Glass & Ceramic Research Institute,CSIR |
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基金项目: | supported by the University of Malaya Research Grant(UMRG)(Nos.RP008C-13AET and RU002/2013) |
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摘 要: | We propose and demonstrate a passively mode-locked fiber laser operating at 1951.8 nm using a commercial thulium-doped fiber(TDF) laser, a homemade double-clad thulium–ytterbium co-doped fiber(TYDF)as the gain media, and a multi-walled carbon nanotube(MWCNT) based saturable absorber(SA). We prepare the MWCNT composite by mixing a homogeneous solution of MWCNTs with a diluted polyvinyl alcohol(PVA) polymer solution and then drying it at room temperature to form a film. The film is placed between two fiber connectors as a SA before it is integrated into a laser ring cavity. The cavity consists of a 2 m long TDF pumped by a 800 nm laser diode and a 15 m long homemade TYDF pumped by a 905 nm multimode laser diode. A stable mode-locking pulse with a repetition rate of 34.6 MHz and a pulse width of 10.79 ps is obtained when the 905 nm multimode pump power reaches 1.8–2.2 W, while the single-mode 800 nm pump power is fixed at 141.5 m W at all times. To the best of our knowledge, this is the first reported mode-locked fiber laser using a MWCNT-based SA.
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关 键 词: | locked walled nanotube Mode-locked 2 absorber pumped repetition polyvinyl locking prepare |
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