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Laser & Optoelectronics Progress, Volume. 61, Issue 23, 2314002(2024)

Gain Performance of Radio Frequency-Excited Axial Fast-Flow CO2 Laser Amplifier

Wei Huang1, Cong You1, Gaojie Lin1, Bo Li1、*, Jiang Zhao2, and Youyou Hu3
Author Affiliations
  • 1School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan , 430074, Hubei , China
  • 2School of Microelectronics, Hubei University, Wuhan 430062, Hubei , China
  • 3College of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, Jiangsu , China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (13)
    Equations (16)
    References (14)
    Cited By (1)
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    Figures & Tables(13)
    Schematic energy level diagram for the CO2-N2-CO system

    Fig. 1. Schematic energy level diagram for the CO2-N2-CO system

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    Experimental light path diagram

    Fig. 2. Experimental light path diagram

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    Amplifier system diagram

    Fig. 3. Amplifier system diagram

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    Vibration temperature iteration convergence trend. (a) CO2(1000); (b) CO2(0110); (c) CO2(0001); (d) N2; (e) CO

    Fig. 4. Vibration temperature iteration convergence trend. (a) CO2(1000); (b) CO2(0110); (c) CO2(0001); (d) N2; (e) CO

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    Relationship between small signal gain and RF injection power under different cavity pressures

    Fig. 5. Relationship between small signal gain and RF injection power under different cavity pressures

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    Vibration temperature changes with excited electron density

    Fig. 6. Vibration temperature changes with excited electron density

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    Relationship between output power and RF injection power of different seed duty cycles

    Fig. 7. Relationship between output power and RF injection power of different seed duty cycles

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    Relationship between small signal gain and CO2 proportion under different cavity pressures

    Fig. 8. Relationship between small signal gain and CO2 proportion under different cavity pressures

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    Output power under three different CO2 proportions

    Fig. 9. Output power under three different CO2 proportions

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    Relationship between small signal gain coefficient and CO2 dissociation ratio under different chamber pressures

    Fig. 10. Relationship between small signal gain coefficient and CO2 dissociation ratio under different chamber pressures

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    Simulation input and output laser pulse waveforms

    Fig. 11. Simulation input and output laser pulse waveforms

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    Small signal gain coefficient versus time during extraction gain stage

    Fig. 12. Small signal gain coefficient versus time during extraction gain stage

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    • Table 1. Physical parameters used in numerical calculation

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      Table 1. Physical parameters used in numerical calculation

      SymbolParameterValueUnit
      λLaser wavelength10.59µm
      BCO2Rotational constant0.4cm
      fUndissociated fraction of CO2 molecules0.56‒
      τspSpontaneous radiation lifetime0.34s-1
      LAmplifier optical path length1800cm
      lEffective discharge length752cm
      FFilling factor0.42‒
      JSpinning quantum number19‒
      X1Symmetric excitation rate5×10-9cm3/s
      X2Bending excitation rate3×10-9cm3/s
      X3Asymmetric excitation rate8×10-9cm3/s
      X4N2 excitation rate2.3×10-8cm3/s
      X5CO excitation rate3×10-8cm3/s
      υ1/cCO2 symmetric excited level wave number1337cm-1
      υ2/cCO2 bending excited level wave number667cm-1
      υ3/cCO2 asymmetric excited level wave number2349cm-1
      υ4/cN2 excited level wave number2330cm-1
      υ5/cCO excited level wave number2150cm-1
      QCO2Collision cross section of CO2 molecules1.3×10-14cm2
      QN2Collision cross section of N2 molecules1.14×10-14cm2
      QHeCollision cross section of He molecules3.7×10-14cm2
      QCOCollision cross section of CO molecules1.14×10-14cm2
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    Wei Huang, Cong You, Gaojie Lin, Bo Li, Jiang Zhao, Youyou Hu. Gain Performance of Radio Frequency-Excited Axial Fast-Flow CO2 Laser Amplifier[J]. Laser & Optoelectronics Progress, 2024, 61(23): 2314002

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    Paper Information

    Category: Lasers and Laser Optics

    Received: Dec. 28, 2023

    Accepted: Mar. 27, 2024

    Published Online: Dec. 10, 2024

    The Author Email: Bo Li (libohust@hust.edu.cn)

    DOI:10.3788/LOP232784

    CSTR:32186.14.LOP232784

    Topics

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