Volume 27 Issue 07
Jun.  2015
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Article Navigation >  High Power Laser and Particle Beams  > 2015  >  27(07): 071013
Yang Shi, Ren Shuqing, Lai Dingguo, et al. High power high voltage constant current capacitor charging power supply[J]. High Power Laser and Particle Beams, 2015, 27: 095006. doi: 10.11884/HPLPB201527.095006
Citation: Sun Yinhong, Feng Yujun, Li Tenglong, et al. 1.06 kW 13 GHz linewidth all fiber laser[J]. High Power Laser and Particle Beams, 2015, 27: 071013. doi: 10.11884/HPLPB201527.071013
shu

1.06 kW 13 GHz linewidth all fiber laser

doi: 10.11884/HPLPB201527.071013
  • 1.

    Institute of Applied Electronics,CAEP,Mianyang 621900,China;

  • 2.

    The Key Laboratory of Science and Technology on High Energy Laser,China Academy of Engineering Physics,Mianyang 621900,China;

  • 3.

    Graduate School of China Academy of Engineering Physics,Beijing 100088,China;

  • 4.

    Department of Engineering Physics,Tsinghua University,Beijing 100084,China

  • Received Date: 2015-04-22
  • Rev Recd Date: 2015-05-24
  • Publish Date: 2015-06-23
    Abstract
  • The suppression methods of stimulated Brillouin scattering (SBS) in high power fiber laser are analyzed. The results indicate broadening the spectrum with high speed phase modulation is one of the most effective ways to suppress SBS. With a broadband noise generator, kW level several 10 GHz linewidth fiber lasers, which are suitable for spectral beam combining, can be easily developed. On purpose of optimizing the parameters of the fiber laser, we calculate the relationship between the laser linewidth and the SBS threshold. At the same time, the effect of noise modulation parameters on spectral broadening is analyzed by numerical calculation. By broadband noise high speed phase modulation, the linewidth of the seed is broadened to 13 GHz. With a two-stage amplifying, the power is enhanced to 10 W. A 20/400 m commercial Yb-doped fiber is used in the final stage amplifier, which convinces central wavelength 1064 nm, linewidth 13 GHz, maximum power 1.06 kW fiber laser. The M2 is better than 1.2 and the O-O efficiency is 86%. During the whole experimental process, the mode instability is not observed. By broadening the bandwidth of the noise generator or enhancing the modulation depth, a higher power narrow linewidth fiber laser can be expected.
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