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Monolithic tapered Yb‑doped fber chirped pulse amplifer delivering 126μJ and 207 MW femtosecond laser with near difraction‑limited beam quality

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Frontiers of Optoelectronics 2023年第3期16卷 169-178页

作者： Tao Wang Bo Ren Can Li Kun Guo Jinyong Leng Pu Zhou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Nanhu Laser Laboratory National University of Defense TechnologyChangsha 410073China Hunan Provincial Key Laboratory of High Energy Laser Technology National University of Defense TechnologyChangsha 410073China

In this work,a high-energy and high peak power chirped pulse amplifcation system with near difraction-limited beam quality based on tapered confned-doped fber(TCF)is experimentally *** TCF has a core numerical aperture of 0.07 with core/cladding diameter of 35/250µm at the thin end and 56/400μm at the thick *** a backward-pumping confguration,a maximum single pulse energy of 177.9μJ at a repetition rate of 504 kHz is realized,corresponding to an average power of 89.7 *** partially compensating for the accumulated nonlinear phase during the amplifcation process via adjusting the high order dispersion of the stretching chirped fber Bragg grating,the duration of the amplifed pulse is compressed to 401 fs with a pulse energy of 126.3μJ and a peak power of 207 MW,which to the best of our knowledge represents the highest peak power ever reported from a monolithic ultrafast fber *** the highest energy,the polarization extinction ratio and the M2 factor were respectively measured to be~19 dB and *** addition,the corresponding intensity noise properties as well as the short-and long-term stability were also examined,verifying a stable operation of the *** is believed that the demonstrated laser source could fnd important applications in,for example,advanced manufacturing and photomedicine.

关键词： High-energy laser Femtosecond laser Tapered fber Fiber laser chirped pulse amplifer

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