Nanosecond Yb-doped fiber MOPA system based on an LCP vortex half-waveplate with a 20 W radially polarized output - Details

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Abstract：

In　this　paper,　we　demonstrate　the　generation　of　a　radially　polarized　beam　(RPB)　with　a　maximum　average　output　power　of　20　W　by　our　self-developed　nanosecond　pulsed　ytterbium　(Yb)-doped　fiber　MOPA　system.　The　method　of　spatial　phase　conversion　was　adopted　for　the　system,　and　a　liquid　crystal　polymer　(LCP)　vortex　half-waveplate　(LCP-WPV)　was　utilized　to　realize　efficient　conversion　of　the　linearly　polarized　LP01　mode　to　the　radially　polarized　TM01　mode.　A　narrow-linewidth,　linearly　polarized　fundamental　mode　with　an　average　power　of　20.5　W　was　produced　in　the　multistage　all-fiber　MOPA　system　consisting　of　a　continuous-wave　(CW)　single-frequency　fiber　laser　seed,　an　electro-optical　intensity　modulator,　two-stage　core-pumped　amplifiers　and　three-stage　cladding-pumped　amplifiers.　Afterwards,　an　RPB　output　with　a　20　W　maximum　average　output　power,　a　7.5　ns　pulse　width　and　a　10　kHz　repetition　rate　was　finally　obtained　after　the　LCP-WPV　was　adopted　as　the　spatial　mode　converter.　Then,　the　mode　purity　of　the　RPB　was　measured　to　be　approximately　88.5　%　with　the　PBS　(polarization　beam　splitter)　method.　This　work　provides　a　reference　for　the　generation　of　cylindrical　vector　beam　sources　with　the　advantages　of　high　efficiency　and　high　mode　purity.　©　2020　Elsevier　GmbH

Keyword：

Liquid crystal polymers Vortex flow Pumping (laser) Fiber amplifiers Polarization Fibers Pulse repetition rate Optically pumped lasers Fiber lasers

Author Community：

[ 1 ] [Song, Yiheng]Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing; 100124, China
[ 2 ] [Song, Yiheng]Key Laboratory of Trans-scale Laser Manufacturing Technology (Beijing University of Technology), Ministry of Education, Beijing; 100124, China
[ 3 ] [Song, Yiheng]Institute of Advanced Technology on Semiconductor Optics & Electronics, Institute of Laser Engineering, Beijing University of Technology, Beijing; 100124, China
[ 4 ] [Song, Yiheng]Science and Technology on Electro-Optical Information Security Control Laboratory, Tianjin; 300308, China
[ 5 ] [Liu, Xuesheng]Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing; 100124, China
[ 6 ] [Liu, Xuesheng]Key Laboratory of Trans-scale Laser Manufacturing Technology (Beijing University of Technology), Ministry of Education, Beijing; 100124, China
[ 7 ] [Liu, Xuesheng]Institute of Advanced Technology on Semiconductor Optics & Electronics, Institute of Laser Engineering, Beijing University of Technology, Beijing; 100124, China
[ 8 ] [Jia, Wenzeng]Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing; 100124, China
[ 9 ] [Jia, Wenzeng]Key Laboratory of Trans-scale Laser Manufacturing Technology (Beijing University of Technology), Ministry of Education, Beijing; 100124, China
[ 10 ] [Jia, Wenzeng]Institute of Advanced Technology on Semiconductor Optics & Electronics, Institute of Laser Engineering, Beijing University of Technology, Beijing; 100124, China
[ 11 ] [Yang, Song]Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing; 100124, China
[ 12 ] [Yang, Song]Key Laboratory of Trans-scale Laser Manufacturing Technology (Beijing University of Technology), Ministry of Education, Beijing; 100124, China
[ 13 ] [Yang, Song]Institute of Advanced Technology on Semiconductor Optics & Electronics, Institute of Laser Engineering, Beijing University of Technology, Beijing; 100124, China
[ 14 ] [Liu, Shu]Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing; 100124, China
[ 15 ] [Liu, Shu]Key Laboratory of Trans-scale Laser Manufacturing Technology (Beijing University of Technology), Ministry of Education, Beijing; 100124, China
[ 16 ] [Liu, Shu]Institute of Advanced Technology on Semiconductor Optics & Electronics, Institute of Laser Engineering, Beijing University of Technology, Beijing; 100124, China
[ 17 ] [Wang, Zhiyong]Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing; 100124, China
[ 18 ] [Wang, Zhiyong]Key Laboratory of Trans-scale Laser Manufacturing Technology (Beijing University of Technology), Ministry of Education, Beijing; 100124, China
[ 19 ] [Wang, Zhiyong]Institute of Advanced Technology on Semiconductor Optics & Electronics, Institute of Laser Engineering, Beijing University of Technology, Beijing; 100124, China

Reprint Author's Address：

[liu, xuesheng]institute of advanced technology on semiconductor optics & electronics, institute of laser engineering, beijing university of technology, beijing; 100124, china;;[liu, xuesheng]beijing engineering research center of laser technology, beijing university of technology, beijing; 100124, china;;[liu, xuesheng]key laboratory of trans-scale laser manufacturing technology (beijing university of technology), ministry of education, beijing; 100124, china

Email：

liuxuesheng@bjut.edu.cn

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