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Chinese Journal of Lasers, Volume. 48, Issue 16, 1601002(2021)

High Efficiency Multipass Pumped Planar Waveguide Laser Amplifier

Bo Qu1、**, Qi Liu1, Sibo Wang1, and Qiang Li1,2,3,4、*
Author Affiliations
  • 1Institute of Laser Engineering, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
  • 2Beijing Engineering Research Center of Laser Technology, Beijing 100124, China
  • 3Beijing Colleges and Universities Engineering Research Center of Advanced Laser Manufacturing, Beijing 100124, China
  • 4Key Laboratory of Trans-Scale Laser Manufacturing Technology, Ministry of Education, Beijing 100124, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (21)
    Equations (0)
    References (19)
    Cited By (2)
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    Figures & Tables(21)
    multipass pumped planar waveguide structure. (a) 3D schematic diagram; (b) x-z schematic diagram

    Fig. 1. multipass pumped planar waveguide structure. (a) 3D schematic diagram; (b) x-z schematic diagram

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    Ray paths of multipass pumping with different angles in x-z plane. (a) Included angle is equal to 90°; (b) included angle is greater than 90°

    Fig. 2. Ray paths of multipass pumping with different angles in x-z plane. (a) Included angle is equal to 90°; (b) included angle is greater than 90°

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    Setup of multipass pumped planar waveguide amplifier

    Fig. 3. Setup of multipass pumped planar waveguide amplifier

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    Double-cladding planar waveguide structure

    Fig. 4. Double-cladding planar waveguide structure

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    Pump setup for double-cladding planar waveguide.(a) Single-end pumped; (b) double-end pumped

    Fig. 5. Pump setup for double-cladding planar waveguide.(a) Single-end pumped; (b) double-end pumped

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    Flowchart of calculation of laser amplification model

    Fig. 6. Flowchart of calculation of laser amplification model

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    Relative intensity distribution curves of seed light in different directions on end face of core. (a) Width direction of core; (b) thickness direction of core

    Fig. 7. Relative intensity distribution curves of seed light in different directions on end face of core. (a) Width direction of core; (b) thickness direction of core

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    Relative intensity distribution curves of pump beam over different waveguides. (a) multipass pumped planar waveguide; (b) double-cladding planar waveguide

    Fig. 8. Relative intensity distribution curves of pump beam over different waveguides. (a) multipass pumped planar waveguide; (b) double-cladding planar waveguide

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    Performance curves of MPWA and DPWA at different power levels. (a) Pump light power is 10 kW; (b) seed light power is 200 W

    Fig. 9. Performance curves of MPWA and DPWA at different power levels. (a) Pump light power is 10 kW; (b) seed light power is 200 W

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    Relationship between absorption coefficient and IIP under different IIS

    Fig. 10. Relationship between absorption coefficient and IIP under different IIS

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    Distribution of absorption coefficient in core of different amplifiers. (a) Single-end pumped DPWA; (b) double-end pumped DPWA; (c) MPWA

    Fig. 11. Distribution of absorption coefficient in core of different amplifiers. (a) Single-end pumped DPWA; (b) double-end pumped DPWA; (c) MPWA

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    Absorbed power density distribution of core layer calculated by different models. (a) Laser amplification model; (b) passive absorption coefficient model

    Fig. 12. Absorbed power density distribution of core layer calculated by different models. (a) Laser amplification model; (b) passive absorption coefficient model

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    Temperature distribution in core of different waveguides. (a) Single-end pumped DPWA; (b) double-end pumped DPWA; (c)MPWA

    Fig. 13. Temperature distribution in core of different waveguides. (a) Single-end pumped DPWA; (b) double-end pumped DPWA; (c)MPWA

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    Relationship between extraction efficiency number and IIP under different IIS

    Fig. 14. Relationship between extraction efficiency number and IIP under different IIS

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    Pumping intensity distribution in core of different waveguides. (a) Single-end pumped DPWA; (b) double-end pumped DPWA; (c)MPWA

    Fig. 15. Pumping intensity distribution in core of different waveguides. (a) Single-end pumped DPWA; (b) double-end pumped DPWA; (c)MPWA

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    Distribution of extraction efficiency in core of different waveguides. (a) Single-end pumped DPWA; (b) double-end pumped DPWA; (c) MPWA

    Fig. 16. Distribution of extraction efficiency in core of different waveguides. (a) Single-end pumped DPWA; (b) double-end pumped DPWA; (c) MPWA

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    Relationship between amplifying light power and core length

    Fig. 17. Relationship between amplifying light power and core length

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    Laser intensity distribution under different conditions. (a) Seed light input; (b) single-end pumped DPWA output; (c) double-end pumped DPWA output; (d) MPWA output

    Fig. 18. Laser intensity distribution under different conditions. (a) Seed light input; (b) single-end pumped DPWA output; (c) double-end pumped DPWA output; (d) MPWA output

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    • Table 1. Parameters of laser amplification model at room temperature

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      Table 1. Parameters of laser amplification model at room temperature

      ParameterσP /cm2σL / cm2f11f12f01f03
      Value7.7×10-212.1×10-200.78020.18150.88250.0437

    • Table 2. Pump absorption calculation results are simulated by laser amplification model and passive absorption coefficient model

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      Table 2. Pump absorption calculation results are simulated by laser amplification model and passive absorption coefficient model

      ParameterSingle-end pumpDPWADouble-end pumpDPWAMPWA
      Amplification modelPassive absorptionAmplification modelPassiveabsorptionAmplificationmodelPassive absorption
      Absorbed power /W662975226638750093389574
      Pump absorptivity /%66.375.266.475.093.395.7
      Effective absorptivity /%88.2--88.2--96.5--

    • Table 3. Maximum stress values for different waveguides

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      Table 3. Maximum stress values for different waveguides

      WaveguideCore /MPaInner layer /MPaOuter layer /MPa
      Single-end pumped DPWA76.873.673.1
      Double-end pumped DPWA118.7112.674.9
      MPWA13.929.084.2
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    Bo Qu, Qi Liu, Sibo Wang, Qiang Li. High Efficiency Multipass Pumped Planar Waveguide Laser Amplifier[J]. Chinese Journal of Lasers, 2021, 48(16): 1601002

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    Paper Information

    Category: laser devices and laser physics

    Received: Nov. 24, 2020

    Accepted: Jan. 27, 2021

    Published Online: Aug. 6, 2021

    The Author Email: Bo Qu (liningqb@qq.com), Qiang Li (ncltlq@bjut.edu.cn)

    DOI:10.3788/CJL202148.1601002

    Topics

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