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Chinese Journal of Lasers, Volume. 50, Issue 14, 1401003(2023)

Wide Repetition Frequency Microsecond Pulsed Fiber Amplifier Based on Acousto-Optic Modulating Mode Switching

Liang Hu1,2, Yong Qian2, Peili Li1, and Jun Zhou1,2,3、*
Author Affiliations
  • 1College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, Jiangsu, China
  • 2Nanjing Institute of Advanced Laser Technology, Nanjing 210038, Jiangsu, China
  • 3Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (8)
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    References (16)
    Cited By (1)
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    Figures & Tables(8)
    Experimental setup schematic

    Fig. 1. Experimental setup schematic

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    AOM driver and pump driver pulse timing. (a) Mode 1; (b) mode 2

    Fig. 2. AOM driver and pump driver pulse timing. (a) Mode 1; (b) mode 2

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    Energy-level diagram of erbium-ytterbium co-doped system

    Fig. 3. Energy-level diagram of erbium-ytterbium co-doped system

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    Power amplifier signal pulse waveform. (a) Repetition frequency of 10 Hz, pulse duration of 1 ms; (b) repetition frequency of 1 kHz, pulse duration of 100 μs; (c) repetition frequency of 1 kHz, pulse duration of 10 μs; (d) repetition frequency of 10 kHz, pulse duration of 10 μs

    Fig. 4. Power amplifier signal pulse waveform. (a) Repetition frequency of 10 Hz, pulse duration of 1 ms; (b) repetition frequency of 1 kHz, pulse duration of 100 μs; (c) repetition frequency of 1 kHz, pulse duration of 10 μs; (d) repetition frequency of 10 kHz, pulse duration of 10 μs

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    Power amplifier output spectrum (spectral resolution is 0.02 nm). (a) Repetition frequency of 10 Hz and pulse duration of 1 ms; (b) repetition frequency 1 kHz and pulse duration of 100 μs; (c) repetition frequency of 1 kHz and pulse duration of 10 μs; (d) repetition frequency of 10 kHz and pulse duration of 10 μs

    Fig. 5. Power amplifier output spectrum (spectral resolution is 0.02 nm). (a) Repetition frequency of 10 Hz and pulse duration of 1 ms; (b) repetition frequency 1 kHz and pulse duration of 100 μs; (c) repetition frequency of 1 kHz and pulse duration of 10 μs; (d) repetition frequency of 10 kHz and pulse duration of 10 μs

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    • Table 1. Working mode of acousto-optic modulator (AOM) radio frequency (RF) driver and pump driver

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      Table 1. Working mode of acousto-optic modulator (AOM) radio frequency (RF) driver and pump driver

      Controlled deviceWorking mode
      Mode 1（pulse width of 100 μs-1 ms，repetition frequency of 10 Hz-1 kHz）Mode 2（pulse width of 10-100 μs，repetition frequency of 1-10 kHz）
      AOM driver

      1）Direct current mode

      2）Amplitude is adjustable

      1）Pulse mode

      2）Waveforms can be simulated and edited

      Preamplifier pump driver

      1）Rectangular pulse mode

      2）Amplitude and pulse width are adjustable

      1）Rectangular pulse mode

      2）Amplitude and pulse width are adjustable

      Power amplifier pump driver

      1）Rectangular pulse mode

      2）Amplitude and pulse width are adjustable

      1）Rectangular pulse mode

      2）Amplitude and pulse width are adjustable

    • Table 2. Pulse timing and pulse width settings of acousto-optic modulator (AOM) radio frequency (RF) driver and pump driver

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      Table 2. Pulse timing and pulse width settings of acousto-optic modulator (AOM) radio frequency (RF) driver and pump driver

      Mode

      Repetition frequency

      frep /Hz

      Pulse width

      τ /μs

      		AOM settingPreamplifier pump settingAmplifier pump setting

      Trigger delay

      tAOM /μs

      Pulse width

      τAOM /μs

      Trigger delay

      tPA /μs

      Pulse width

      τPA /μs

      Trigger delay

      tBO /μs

      Pulse width

      τBO /μs

      1

      10

      1000

      1000

      100

      0

      0

      1500

      400

      390

      280

      1100

      110

      2

      1000

      10000

      10

      10

      390

      70

      11

      11

      0

      0

      300

      80

      140

      18

      160

      60

    • Table 3. Pulsed fiber amplifier output parameters

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      Table 3. Pulsed fiber amplifier output parameters

      Mode

      Repetition frequency

      frep /Hz

      Pulse duration

      τ /μs

      Peak power after modulation

      PIN /W

      Peak power of preamplifier

      PPA /W

      Peak power of power amplifier

      PBO /W

      Optical conversion efficiency

      η /%

      1

      10

      100

      1000

      1000

      1000

      100

      0.02025

      0.02025

      0.02025

      1.50

      1.55

      1.56

      30.90

      30.50

      30.02

      34.68

      34.23

      33.69

      2

      1000

      2000

      10000

      10

      10

      10

      0.03060

      0.03035

      0.03190

      2.07

      2.08

      2.16

      30.01

      30.05

      30.07

      19.50

      21.95

      24.19

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    Liang Hu, Yong Qian, Peili Li, Jun Zhou. Wide Repetition Frequency Microsecond Pulsed Fiber Amplifier Based on Acousto-Optic Modulating Mode Switching[J]. Chinese Journal of Lasers, 2023, 50(14): 1401003

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    Paper Information

    Category: laser devices and laser physics

    Received: Dec. 12, 2022

    Accepted: Mar. 1, 2023

    Published Online: Jul. 10, 2023

    The Author Email: Zhou Jun (junzhousd@mail.siom.ac.cn)

    DOI:10.3788/CJL221518

    Topics

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