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  • Received: Apr. 27, 2020

    Accepted: Jun. 24, 2020

    Posted: Sep. 21, 2020

    Published Online: Sep. 21, 2020

    The Author Email: Xing Fu (

    DOI: 10.1017/hpl.2020.28

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    Tinghao Liu, Qiang Liu, Zhan Sui, Mali Gong, Xing Fu. Spatiotemporal characterization of laser pulse amplification in double-pass active mirror geometry[J]. High Power Laser Science and Engineering, 2020, 8(3): 03000e30

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High Power Laser Science and Engineering, Vol. 8, Issue 3, 03000e30 (2020)

Spatiotemporal characterization of laser pulse amplification in double-pass active mirror geometry

Tinghao Liu1,2, Qiang Liu1,2, Zhan Sui3, Mali Gong1,2, and Xing Fu1,2,*

Author Affiliations

  • 1Key Laboratory of Photonic Control Technology (Tsinghua University), Ministry of Education, Beijing 100084, China
  • 2State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
  • 3Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai 201800, China


We present a spatiotemporal model of pulse amplification in the double-pass active mirror (AM) geometry. Three types of overlap condition are studied, and the spatiotemporal scaling under the four-pulse overlapping (4PO) condition is fully characterized for the first time, by mapping the temporal and spatial segments of beam to the instantaneous gain windows. Furthermore, the influence of spatiotemporal overlaps on the amplified energy, pulse distortion and intensity profile is unraveled for both AM and zigzag configurations. The model, verified by excellent agreement between the predicted and measured results, can be a powerful tool for designing and optimizing high energy multi-pass solid-state laser amplifiers with AM, zigzag and other geometries.


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