12 January 2018 1-MHz high power femtosecond Yb-doped fiber chirped-pulse amplifier
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A practical femtosecond polarization-maintaining Yb-doped fiber amplifier enabling 153 fs transform-limited pulse duration with 32 μJ pulse energy at 1 MHz repetition rate corresponding to a peak power of 0.21 GW is demonstrated. The laser system based on chirped-pulse amplification (CPA) technique is seeded by a dispersion managed, nonlinear polarization evolution (NPE) mode-locked oscillator with spectrum bandwidth of 31 nm at 1040 nm and amplified by three fiber pre-amplifying stages and a rod type fiber main amplifying stage. The laser works with beam quality of M2 of 1.3 and power stability of ∼0.63% (root mean square, RMS) over 24 hours will be stable sources for industrial micromachining, medical therapy and scientific research.
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Zhong-Qi Hu, Zhong-Qi Hu, Pei-Long Yang, Pei-Long Yang, Hao Teng, Hao Teng, Jiang-Feng Zhu, Jiang-Feng Zhu, Zhi-Yi Wei, Zhi-Yi Wei, "1-MHz high power femtosecond Yb-doped fiber chirped-pulse amplifier", Proc. SPIE 10619, 2017 International Conference on Optical Instruments and Technology: Advanced Laser Technology and Applications, 106190P (12 January 2018); doi: 10.1117/12.2295472; https://doi.org/10.1117/12.2295472

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