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Chinese Optics Letters, Volume. 23, Issue 3, 031402(2025)

2-kW all polarization-maintaining fiber ultrafast laser at a GHz repetition rate Editors' Pick

Hao Xiu1, Yiheng Fan1, Tianxi Wang1, Wenlong Wang1, Wei Lin1, Xiaoming Wei1、*, and Zhongmin Yang1,2,3
Author Affiliations
  • 1School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
  • 2School of Materials Science and Engineering, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou 510641, China
  • 3Research Institute of Future Technology, South China Normal University, Guangzhou 510006, China
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    Schematic diagram of the all-fiber fs laser system. All the fibers used in the system are polarization-maintained. SESAM, semiconductor saturable absorber mirror; YSF, Yb-doped single-mode fiber; DF, dielectric film; YDF, Yb-doped double-cladding fiber; WDM, wavelength-division multiplexer; OC, optical coupler; SM-LD, single-mode laser diode; ISO, isolator; CIRs, circulators; CFBGs, chirped fiber Bragg gratings; MM-LDs, multimode laser diodes; MFA, mode field adaptor; CPS, cladding power stripper; SPC, signal-pump combiner.

    Fig. 1. Schematic diagram of the all-fiber fs laser system. All the fibers used in the system are polarization-maintained. SESAM, semiconductor saturable absorber mirror; YSF, Yb-doped single-mode fiber; DF, dielectric film; YDF, Yb-doped double-cladding fiber; WDM, wavelength-division multiplexer; OC, optical coupler; SM-LD, single-mode laser diode; ISO, isolator; CIRs, circulators; CFBGs, chirped fiber Bragg gratings; MM-LDs, multimode laser diodes; MFA, mode field adaptor; CPS, cladding power stripper; SPC, signal-pump combiner.

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    Output power of the 2-kW-average-power main amplifier as a function of the pump power. The inset shows the power stability in an hour.

    Fig. 2. Output power of the 2-kW-average-power main amplifier as a function of the pump power. The inset shows the power stability in an hour.

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    Optical spectra of the main amplifier at different levels of average powers. The inset shows a wider span of 200 nm. ASE, amplified spontaneous emission; SRS, stimulated Raman scattering.

    Fig. 3. Optical spectra of the main amplifier at different levels of average powers. The inset shows a wider span of 200 nm. ASE, amplified spontaneous emission; SRS, stimulated Raman scattering.

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    Measurement of the beam quality M2, measured before the compressor at an output power of 2001 W. Inset: beam profile.

    Fig. 4. Measurement of the beam quality M2, measured before the compressor at an output power of 2001 W. Inset: beam profile.

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    Measurement of the autocorrelation trace (blue) and its hyperbolic secant (sech2) fitting (red), measured at the maximum output power.

    Fig. 5. Measurement of the autocorrelation trace (blue) and its hyperbolic secant (sech2) fitting (red), measured at the maximum output power.

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    • Table 1. Key Parameters of the High Average Power Ultrafast Pulsed Lasers

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      Table 1. Key Parameters of the High Average Power Ultrafast Pulsed Lasers

      Repetition rate (MHz)Average power (W)Pulse duration (fs)Beam quality (M2)Fiber typeRef.
      691052∼800< 1.2non-PM[8]
      80896 ± 502541.2PM[20]
      806128631.29PM[21]
      1.39 × 1031200800< 1.1PM[15]
      2581593450—non-PM[11]
      1.39 × 1032001855< 1.2PMThis work

    • Table 2. Specifications of the Key Components Used in the Laser System

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      Table 2. Specifications of the Key Components Used in the Laser System

      Component typeDevice nameSpecification
      Optical fiber deviceSPC3Pump fiber typeMM 220/242
      Input fiber typePLMA-GDF-20/400-M
      Output fiber typePLMA-GDF-20/400-M
      MFAInput fiber typePM-GDF-10/125-M
      Output fiber typePLMA-GDF-20/400-M
      CPSPassive fiber typePLMA-GDF-20/400-M
      End capPassive fiber typePLMA-GDF-20/400-M
      SM-LDMaximum output power460 mW
      MM-LDMaximum output power27 W
      MM-LDsMaximum output power800 W × 2 & 1100 W × 1
      FiberYSFHomemade
      YDF 6/125IXF-DF-PM-6-125
      YDF 10/125PM-YDF-10/125-M
      YDF 20/400PLMA-YDF-20/400-M
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    Hao Xiu, Yiheng Fan, Tianxi Wang, Wenlong Wang, Wei Lin, Xiaoming Wei, Zhongmin Yang, "2-kW all polarization-maintaining fiber ultrafast laser at a GHz repetition rate," Chin. Opt. Lett. 23, 031402 (2025)

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    Paper Information

    Category: Lasers, Optical Amplifiers, and Laser Optics

    Received: Jun. 26, 2024

    Accepted: Sep. 6, 2024

    Published Online: Mar. 14, 2025

    The Author Email: Xiaoming Wei (xmwei@scut.edu.cn)

    DOI:10.3788/COL202523.031402

    CSTR:32184.14.COL202523.031402

    Topics

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