Acousto-optic tunable ultrafast laser with vector-mode-coupling-induced polarization conversion  

作　　者：Yujia Li Ligang Huang Haonan Han Lei Gao Yulong Cao Yuan Gong Wending Zhang Feng Gao Iroegbu Paul Ikechukwu Tao Zhu 

机构地区：[1]Key Laboratory of Optoelectronic Technology & Systems,Ministry of Education,Chongqing University,Chongqing 400044,China [2]Key Laboratory of Optical Fiber Sensing and Communications, Ministry of Education,University of Electronic Science and Technology of China,Chengdu 611731,China [3]MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology, School of Science,Northwestern Polytechnical University,Xi'an 710072,China [4]MOE Key Laboratory of Weak-Light Nonlinear Photonics,TEDA Applied Physics Institute and School of Physics,Nankai University,Tianjin 300457,China

出　　处：《Photonics Research》2019年第7期113-120,共8页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(NSFC)(61635004,61705023,61705024);Key Research and Development Project of Ministry of Science and Technology(2016YFC0801200);Chongqing Postdoctoral Program for Innovative Talents(CQBX201703);Postdoctoral Science Foundation of Chongqing(Xm2017047);Natural Science Foundation of Chongqing(cstc2018jcyjAX0644);Science and Technology on Plasma Physics Laboratory(6142A0403050817);National Science Fund for Distinguished Young Scholars(61825501)

摘　　要：Acousto-optic interactions, employed in the ultrafast laser regulation,possess remarkable advantages for fast tuning performance in a wide spectral range. Here, we propose an ultrafast fiber laser whose wideband tunability is provided by an acousto-optic structure fabricated with an etched single-mode fiber. Because of the laser polarization conversion induced by the coupling between the core and cladding vector modes in the etched fiber,a band-pass characteristic of the acousto-optic interaction is achieved to effectively regulate the inner-cavity gain range. Cooperating with a saturable absorber based on single-wall carbon nanotubes (SWCNTs) with polarization robustness,a soliton operating state is achieved in the tunable erbium-doped fiber laser.By controlling the acoustical wave frequency from 1.039 to 1.069 MHz, this soliton laser can be conveniently tuned in a wide spectral range from 1571.52 to 1539.26nm.Meanwhile, the laser pulses have near-transform-limited durations stably maintaining less than 2 ps at different wavelength channels,owing to the broadband nonlinear absorption of SWCNTs.Acousto-optic interactions, employed in the ultrafast laser regulation, possess remarkable advantages for fast tuning performance in a wide spectral range. Here, we propose an ultrafast fiber laser whose wideband tunability is provided by an acousto-optic structure fabricated with an etched single-mode fiber. Because of the laser polarization conversion induced by the coupling between the core and cladding vector modes in the etched fiber, a band-pass characteristic of the acousto-optic interaction is achieved to effectively regulate the inner-cavity gain range. Cooperating with a saturable absorber based on single-wall carbon nanotubes(SWCNTs) with polarization robustness, a soliton operating state is achieved in the tunable erbium-doped fiber laser. By controlling the acoustical wave frequency from 1.039 to 1.069 MHz, this soliton laser can be conveniently tuned in a wide spectral range from 1571.52 to 1539.26 nm. Meanwhile, the laser pulses have near-transform-limited durations stably maintaining less than 2 ps at different wavelength channels, owing to the broadband nonlinear absorption of SWCNTs.

关 键 词：polarization ACOUSTO-OPTIC interactions nonlinear 

分 类 号：O4[理学—物理]