Chinese Journal of Lasers, Volume. 51, Issue 22, 2201012(2024)

Temporal Coherent Combination of 256 Femtosecond Pulses

Bowei Yang1, Yunfeng Wu1,2, Yanrong Song2, and Zhigang Zhang1、*
Author Affiliations
  • 1School of Electronics, Peking University, Beijing 100871, China
  • 2School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China
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    Figures & Tables(9)
    Schematic of polarization delay combination of pulse cluster with state after π phase shift of pulse electric field shown by dashed line
    Schematic of pulse temporal coherent combination system
    Photograph of femtosecond fiber laser with repetition rate of 1 GHz as seed laser and output spectral shape. (a) Photograph of laser; (b) output spectral shape
    Phase modulation signal with p-polarized light as example (truncated part)
    Schematic of MPC
    Relative intensity and average power of combined pulse versus time. (a) Relative intensity; (b) average power
    Amplified pulse spectrum and autocorrelation curve of combined pulse. (a) Pulse spectrum; (b) autocorrelation curve
    • Table 1. Configuration of delay line at each level

      View table

      Table 1. Configuration of delay line at each level

      Stage No.Optical path length /mType of delay lineParameter
      10.15PlanoMirror distance of 0.075 m,one roundtrip
      218.20Plano-concaveRadius of curvature of 1.2 m,mirror distance of 0.740 m,11 roundtrips
      39.60Dual concaveRadius of curvature of 0.6 m,mirror distance of 0.266 m,17 roundtrips
      44.80Dual concaveRadius of curvature of 0.6 m,mirror distance of 0.130 m,15 roundtrips
      52.40Plano-concaveRadius of curvature of 1.2 m,mirror distance of 0.080 m,13 roundtrips
      61.20PlanoMirror distance of 0.600 m,one roundtrip
      70.60PlanoMirror distance of 0.300 m,one roundtrip
      80.30PlanoMirror distance of 0.150 m,one roundtrip
    • Table 2. Output parameters of magnification at each level

      View table

      Table 2. Output parameters of magnification at each level

      Parameter1st pre-amplifier2nd pre-amplifier3rd pre-amplifierMain amplifier
      Pump power /W0.50.698
      Average power /W0.00250.010.492
      Pulse energy /nJ0.973.91951170 (after combination and compression)
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    Bowei Yang, Yunfeng Wu, Yanrong Song, Zhigang Zhang. Temporal Coherent Combination of 256 Femtosecond Pulses[J]. Chinese Journal of Lasers, 2024, 51(22): 2201012

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    Paper Information

    Category: laser devices and laser physics

    Received: Dec. 13, 2023

    Accepted: Apr. 29, 2024

    Published Online: Nov. 19, 2024

    The Author Email: Zhang Zhigang (zhgzhang@pku.edu.cn)

    DOI:10.3788/CJL231521

    CSTR:32183.14.CJL231521

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