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Frequency-Modulated Pulse Waveform Measurement Based on Lens Array and Fiber Bundle

ZHANG Bo1 PENG Zhitao1 SUN Zhihong1 XIA Yanwen1 LU Zonggui1 DONG Jun1

(1.Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, Sichuan Province, China 621900)
【Knowledge Link】Raman scattering

【Abstract】This study proposes a method based on lens array and fiber bundle for measuring frequency-modulated pulse waveforms. Grade-index fiber can provide a large receiver aperture that allows optimum laser energy transmission and performing measurements a wide dynamical range. Lens array can decrease the drift of laser spot on the fiber end face. Combining these two benefits, the system will have a high transmission efficiency from the laser near field to the fiber bundle. Results indicate that the proposed method can perform high-accuracy measurements of frequency-modulated pulse waveforms, with the measurement contrast ratio reaching 630:1.

【Keywords】 laser optics; waveform measurement; lens array; fiber bundle; coupling efficiency; contrast ratio;

【DOI】

【Funds】 National Natural Science Foundation of China (61605185) Young Talent Growth Fund of Laser Fusion Research Center of the China Academy of Engineering Physics (RCFCZ-2017–12)

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This Article

ISSN:0258-7025

CN: 31-1339/TN

Vol 47, No. 03, Pages 42-48

March 2020

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Abstract

  • 1 Introduction
  • 2 Test technology and method
  • 3 Experiment
  • 4 Conclusions
  • References