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26 February 2018 1-kW monolithic narrow linewidth linear-polarized fiber laser at 1030 nm
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Proceedings Volume 10512, Fiber Lasers XV: Technology and Systems; 105122S (2018)
Event: SPIE LASE, 2018, San Francisco, California, United States
We demonstrate an all-fiberized, linear-polarized, narrow spectral linewidth laser system with kilowatts-level output power at 1030 nm in master oscillator-power amplifier (MOPA) configuration. The laser system consists of a linear-polarized, narrow linewidth (~28 GHz) fiber laser oscillator and two stages of linear-polarized fiber amplifiers. A 925 W linear-polarized fiber laser with a polarization extinction ratio (PER) of 15.2 dB and a spectral width of ~60 GHz at the central wavelength of 1030.1 nm is achieved. Owing to the setting of the appropriate parameters for the laser, no indication of Stimulate Brillouin Scattering (SBS) is observed in the system. Moreover, thanks to the excellent quantum efficiency of the laser and the thightly coiling of the active fiber in the main amplifier, the mode instability (MI) is successfully avoided. As a result, the near diffraction-limited beam quality (M2<1.3) is achieved.
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Yang Xu, Qiang Fang, Xuelong Cui, Bowen Hou, Shijie Fu, Zhaoxin Xie, and Wei Shi "1-kW monolithic narrow linewidth linear-polarized fiber laser at 1030 nm", Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105122S (26 February 2018);

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