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Infrared and Laser Engineering, Volume. 49, Issue 10, 20200009(2020)

Numerical analysis on backward light amplification and damage in high-power fiber laser

Quan Sheng1, Hanying Si2, Jianmin An3, Haiwei Zhang4, Junxiang Zhang1, Yu Ding2, Shengcai Li5, Wei Shi1, and Jianquan Yao1
Author Affiliations
  • 1School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
  • 2Science and Technology on Electro-Optical Information Security Control Laboratory, Tianjin 300308, China
  • 3Air-loading The Third Military Representative Room in Tianjin Area, Tianjin 300308, China
  • 4School of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin 300384, China
  • 5Armored Forces Research Institute of Army Research Academy, Beijing 100072, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (9)
    Equations (6)
    References (12)
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    Figures & Tables(9)
    Theoretical model of the ytterbium-doped fiber amplifer (YDFA)

    Fig. 1. Theoretical model of the ytterbium-doped fiber amplifer (YDFA)

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    Forward signal, pump power and normalized population inversion of fiber amplifier as functions of fiber position z （Pp(0)=11.8 kW、Ps+(0)=1 kW）

    Fig. 2. Forward signal, pump power and normalized population inversion of fiber amplifier as functions of fiber position z （Pp(0)=11.8 kW、Ps+(0)=1 kW）

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    Amplification of different incident backward powers in the active fiber （Pp(0)=11.8 kW、Ps+(0)=1 kW）

    Fig. 3. Amplification of different incident backward powers in the active fiber （Pp(0)=11.8 kW、Ps+(0)=1 kW）

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    Signal output power and amplified backward power as functions of incident backward power （Pp(0)=11.8 kW, Ps+(0)=1 kW）

    Fig. 4. Signal output power and amplified backward power as functions of incident backward power （Pp(0)=11.8 kW, Ps+(0)=1 kW）

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    Thermal load per unit length in the gain fiber and the total thermal load（Pp(0)=11.8 kW, Ps−(10)=1 kW）

    Fig. 5. Thermal load per unit length in the gain fiber and the total thermal load（Pp(0)=11.8 kW, Ps−(10)=1 kW）

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    Temperature distribution with different backward powers in the active fiber（Pp(0)=11.8 kW, Ps−(10)=1 kW）

    Fig. 6. Temperature distribution with different backward powers in the active fiber（Pp(0)=11.8 kW, Ps−(10)=1 kW）

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    Amplification of backward signal in the active fiber with different forward signal powers（Pp(0)=11.8 kW, Ps−(10)=10 W）

    Fig. 7. Amplification of backward signal in the active fiber with different forward signal powers（Pp(0)=11.8 kW, Ps−(10)=10 W）

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    • Table 1. [in Chinese]

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      Table 1. [in Chinese]

      ParametersIPG Photonics[3]CAEP report [7]SIOM report[7]
      Output power/kW1010.610.14
      StructureOscillator and one-stage amplifier
      Laser wavelength/nm1 0701 0801 070
      Seed power1 kW1 kW170 W
      Fiber core size and lengths30 μm，15 m30/900 μm，25 m30/900 μm，18 m
      Pump scheme1018 nm，12690 W， backward pumping 976 nm，11500 W， forward pumping 976 nm，11359 W， bidirectional pumping

    • Table 2. [in Chinese]

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      Table 2. [in Chinese]

      ParametersValueParametersValue
      λp/nmPump wavelength976λs/nm Signal wavelength1080
      ΓpSignal overlap efficiency0.85ΓsSignal overlap efficiency0.85
      Rcore/μm Core diameter30Rcladding/μm Clad diameter900
      σa(λp)/m2Pump absorption cross section8.5×10−25σa(λs)/m2Pump absorption cross section8.5×10−26
      σe(λp)/m2Pump emission cross section8.2×10−25σe(λs)/m2Pump emission cross section9.9×10−26
      h/J·s−1Planck constant6.626×10−34c/m·s−1Light speed3×108
      N/m−3Yb3+doping concentration 1.3×1026τ/ms Upper laser level lifetime0.84
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    Quan Sheng, Hanying Si, Jianmin An, Haiwei Zhang, Junxiang Zhang, Yu Ding, Shengcai Li, Wei Shi, Jianquan Yao. Numerical analysis on backward light amplification and damage in high-power fiber laser[J]. Infrared and Laser Engineering, 2020, 49(10): 20200009

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    Paper Information

    Category: Laser & laser optics

    Received: Jan. 9, 2020

    Accepted: --

    Published Online: Jul. 6, 2021

    The Author Email:

    DOI:10.3788/IRLA20200009

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology