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Chinese Journal of Lasers, Volume. 52, Issue 6, 0601006(2025)

High-Energy Hundred-Nanosecond Two-Micron Laser Amplifier Based on (Tm, Ho)∶YLF Crystals

Fangxin Yue1,2,3, Junxuan Zhang1,2、*, Jie Meng1,3, Ting Yu1,3, Xiaolei Zhu1,2,4, Jiqiao Liu1,2,3,4, and Weibiao Chen1,4
Author Affiliations
  • 1Wangzhijiang Innovation Center for Laser, Aerospace Laser Technology and System Department, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 2Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 3Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 4Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (9)
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    References (17)
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    Figures & Tables(9)
    Design diagram of 8-shaped MO

    Fig. 1. Design diagram of 8-shaped MO

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    Pump head structure and its fluorescence distribution in crystal. (a) Pump head; (b) fluorescence distribution of pump light in crystal

    Fig. 2. Pump head structure and its fluorescence distribution in crystal. (a) Pump head; (b) fluorescence distribution of pump light in crystal

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    Structure of three-stage power amplifier

    Fig. 3. Structure of three-stage power amplifier

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    Input/output characteristics of MO in free-running mode

    Fig. 4. Input/output characteristics of MO in free-running mode

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    Input/output characteristics and pulse duration of MO as a function of pump energy at repetition rate of 10 Hz

    Fig. 5. Input/output characteristics and pulse duration of MO as a function of pump energy at repetition rate of 10 Hz

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    Output characteristics of three-stage double-pass power amplifier at repetition rate of 10 Hz

    Fig. 6. Output characteristics of three-stage double-pass power amplifier at repetition rate of 10 Hz

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    Pulse waveform and laser wavelength after three stage amplification. (a) Pulse waveform; (b) laser wavelength

    Fig. 7. Pulse waveform and laser wavelength after three stage amplification. (a) Pulse waveform; (b) laser wavelength

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    Near-field spots. (a) When output energy of MO is 58.5 mJ; (b) when output energy of first stage amplifier is 89.5 mJ; (c) when output energy of second stage amplifier is 128 mJ; (d) when output energy of three-stage amplifier is 201 mJ

    Fig. 8. Near-field spots. (a) When output energy of MO is 58.5 mJ; (b) when output energy of first stage amplifier is 89.5 mJ; (c) when output energy of second stage amplifier is 128 mJ; (d) when output energy of three-stage amplifier is 201 mJ

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    • Table 1. Parameters of each power amplification stage

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      Table 1. Parameters of each power amplification stage

      ParameterContent
      Amp1Amp2Amp3
      Active medium(Tm, Ho) ∶YLF(Tm, Ho) ∶YLF(Tm, Ho) ∶YLF
      Crystal size /mmΦ4×20.4Φ4.5×41.8Φ4.5×41.8
      Atomic fraction of Ho /%0.50.50.5
      Atomic fraction of Tm /%555
      Amplification structureDouble passDouble passDouble pass
      Beam size of seed light /mm1.81.92.0
      Seed lightp polarized lights polarized lightp polarized light
      Peak power of each bar /W100100100
      Number of LD bars3×2×66×2×66×2×6
      Pump duration /ms111
      Maximum pump energy /J3.67.27.2
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    Fangxin Yue, Junxuan Zhang, Jie Meng, Ting Yu, Xiaolei Zhu, Jiqiao Liu, Weibiao Chen. High-Energy Hundred-Nanosecond Two-Micron Laser Amplifier Based on (Tm, Ho)∶YLF Crystals[J]. Chinese Journal of Lasers, 2025, 52(6): 0601006

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    Paper Information

    Category: laser devices and laser physics

    Received: Sep. 30, 2024

    Accepted: Nov. 19, 2024

    Published Online: Mar. 18, 2025

    The Author Email: Junxuan Zhang (zhangjunxuan58@hotmail.com)

    DOI:10.3788/CJL241234

    CSTR:32183.14.CJL241234

    Topics

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