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design of large mode area all-solid anti-resonant fiber for high-power lasers

High Power Laser Science and Engineering 2021年第2期9卷 161-167页

作者： Xin Zhang Shoufei Gao Yingying Wang Wei Ding Pu Wang National Center of Laser Technology Institute of Laser EngineeringBeijing University of TechnologyBeijing 100124China Institute of Photonics Technology Jinan UniversityGuangzhou 510632China

High-power fiber lasers have experienced a dramatic development over the last *** increasing the output power needs an upscaling of the fiber mode area,while maintaining a single-mode ***,we propose an all-solid anti-resonant fiber(ARF)structure,which ensures single-mode operation in broadband by resonantly coupling higherorder modes into the cladding.A series of fibers with core sizes ranging from 40 to 100µm are proposed exhibiting maximum mode area exceeding 5000µ*** simulations show this resonant coupling scheme provides a higher-order mode(mainly TE01,TM01,and HE21)suppression ratio of more than 20 dB,while keeping the fundamental mode loss lower than 1 dB/*** proposed structure also exhibits high tolerance for core index depression.

关键词： fiber design laser amplifiers modeling and optimization optical devices optical materials

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Novel constant-cladding tapered-core ytterbium-doped fiber for high-power fiber laser oscillator

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High Power Laser Science and Engineering 2021年第2期9卷 142-148页

作者： Yun Ye Xianfeng Lin Xiaoming Xi Chen Shi Baolai Yang Hanwei Zhang Xiaolin Wang Jinyan Li Xiaojun Xu College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Wuhan National Laboratory for Optoelectronics(WNLO) Huazhong University of Science and TechnologyWuhan 430074China

Power scaling based on traditional ytterbium-doped fibers(YDFs)is limited by optical nonlinear effects and transverse mode instability(TMI)in high-power fiber ***,we propose a novel long tapered fiber with a constant cladding and tapered core(CCTC)along its axis *** tapered-core region of the fiber is designed to enhance the stimulated Raman scattering(SRS)threshold and suppress higher-order mode resonance in the laser *** CCTC YDF was fabricated successfully with a modified chemical vapor deposition(MCVD)method combined with solution doping technology,which has a cladding diameter of 400µm and a varying core with a diameter of~24μm at both ends and~31μm in the *** test the performance of the CCTC fiber during high-power operation,an all-fiber laser oscillator based on a CCTC YDF was investigated *** a result,a maximum output power of 3.42 kW was achieved with an optical-to-optical efficiency of 55.2%,although the TMI effect was observed at an output power of~3.12 *** measured beam quality(M^(2)factor)was~1.7,and no sign of the Raman component was observed in the *** believe that CCTC YDF has great potential to simultaneously mitigate the SRS and TMI effects,and further power scaling is promising by optimizing the structure of the YDF.

关键词： fiber design high power stimulated Raman scattering transverse mode instability ytterbium-doped fiber

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