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Chinese Journal of Lasers, Volume. 50, Issue 6, 0601001(2023)

Theoretical Analysis and Experimental Study of Pulse Characteristics of Fe2+∶ZnSe Passively Q-switched 2.794 μm Laser with High Repetition Rate

Zhengdong Xiong1,2, Lingling Jiang1,2, Tingqing Cheng1, and Haihe Jiang1,2、*
Author Affiliations
  • 1Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China
  • 2University of Science and Technology of China, Hefei 230031, Anhui, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (7)
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    References (17)
    Cited By (2)
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    Figures & Tables(7)
    Output pulse width versus initial transmittance of saturable absorber

    Fig. 1. Output pulse width versus initial transmittance of saturable absorber

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    Schematic of experimental device

    Fig. 2. Schematic of experimental device

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    Output pulse waveforms measured in laser Q-switching experiments under different parameters. (a) T0=93.6%,R=40%,Ф3 mm×100 mm; (b) T0=93.6%,R=30%,Ф3 mm×100 mm; (c) T0=93.6%,R=40%,Ф4 mm×100 mm; (d) T0=93.6%,R=30%,Ф4 mm×100 mm; (e) T0=91.9%,R=40%,Ф3 mm×100 mm; (f) T0=91.9%,R=30%,Ф3 mm×100 mm; (g) T0=91.9%,R=40%,Ф4 mm×100 mm; (h) T0=91.9%,R=30%,Ф4 mm×100 mm

    Fig. 3. Output pulse waveforms measured in laser Q-switching experiments under different parameters. (a) T0=93.6%,R=40%,Ф3 mm×100 mm; (b) T0=93.6%,R=30%,Ф3 mm×100 mm; (c) T0=93.6%,R=40%,Ф4 mm×100 mm; (d) T0=93.6%,R=30%,Ф4 mm×100 mm; (e) T0=91.9%,R=40%,Ф3 mm×100 mm; (f) T0=91.9%,R=30%,Ф3 mm×100 mm; (g) T0=91.9%,R=40%,Ф4 mm×100 mm; (h) T0=91.9%,R=30%,Ф4 mm×100 mm

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    Output spectrum measured in laser Q-switching experiment with Ф3 mm×100 mm Er, Cr∶YSGG crystal at 60 Hz

    Fig. 4. Output spectrum measured in laser Q-switching experiment with Ф3 mm×100 mm Er, Cr∶YSGG crystal at 60 Hz

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    Output pulse waveforms measured in laser Q-switching experiment with Ф3 mm×100 mm Er, Cr∶YSGG crystal at 60 Hz. (a)(b) T0=93.6%; (c)(d) T0=91.9%

    Fig. 5. Output pulse waveforms measured in laser Q-switching experiment with Ф3 mm×100 mm Er, Cr∶YSGG crystal at 60 Hz. (a)(b) T0=93.6%; (c)(d) T0=91.9%

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    Measured beam quality factors under different T0. (a) T0=93.6%; (b) T0=91.9%

    Fig. 6. Measured beam quality factors under different T0. (a) T0=93.6%; (b) T0=91.9%

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    • Table 1. Theoretical and experimental results of passive Q-switched laser

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      Table 1. Theoretical and experimental results of passive Q-switched laser

      Initial transmittance of saturable absorberMethodSize of laser crystal rodResult
      R=40%R=30%
      93.6%NumericalPulse width of 134.1 nsPulse width of 167.1 ns
      ExperimentalФ3 mm×100 mm

      Pulse width of 140.6 ns，

      pulse energy of 4.2 mJ，spot diameter of 1.36 mm

      Pulse width of 161.0 ns，

      pulse energy of 3.9 mJ，spot diameter of 1.30 mm

      Ф4 mm×100 mm

      Pulse width of 146.7 ns，

      pulse energy of 6.1 mJ，spot diameter of 1.64 mm

      Pulse width of 175.0 ns，

      pulse energy of 6 mJ，spot diameter of 1.68 mm

      91.9%NumericalPulse width of 82.0 nsPulse width of 100.9 ns
      ExperimentalФ3 mm×100 mm

      Pulse width of 81.0 ns，

      pulse energy of 6.3 mJ，spot diameter of 1.33 mm

      Pulse width of 91.8 ns，

      pulse energy of 6.1 mJ，spot diameter of 1.31 mm

      Ф4 mm×100 mm

      Pulse width of 83.3 ns，

      pulse energy of 8.7 mJ，spot diameter of 1.60 mm

      Pulse width of 89.2 ns，

      pulse energy of 8.9 mJ，spot diameter of 1.67 mm

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    Zhengdong Xiong, Lingling Jiang, Tingqing Cheng, Haihe Jiang. Theoretical Analysis and Experimental Study of Pulse Characteristics of Fe2+∶ZnSe Passively Q-switched 2.794 μm Laser with High Repetition Rate[J]. Chinese Journal of Lasers, 2023, 50(6): 0601001

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    Paper Information

    Category: laser devices and laser physics

    Received: Apr. 28, 2022

    Accepted: May. 17, 2022

    Published Online: Dec. 27, 2022

    The Author Email: Jiang Haihe (hjiang@aiofm.ac.cn)

    DOI:10.3788/CJL220800

    Topics

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