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<p>Photonic Doppler Velocimetry (PDV) systems operating at wavelengths shorter than the classical telecom band are of interest for low-velocity measurements and for measuring smaller particles ejected from a material. As velocity resolution is proportional to wavelength, a PDV system at 532&#xa0;nm (green) provides a theoretical threefold gain in precision compared to standard 1550-nm systems. First, we tested a 532-nm triature (push-pull) PDV system when the velocity reached was limited to a few hundreds of m/s in plate-impact and laser-shock experiments. Using the triature phase analysis increases the time resolution and compensates for the fact that the system is not frequency shifted. In order to measure higher velocities and possibly particles, another system was built with greater lasing power, a 200&#xa0;MHz Acousto Optic Modulator and a faster photo-receiver. A surface velocity above 1000&#xa0;m/s was measured. These 532&#xa0;nm PDV systems were created with single-mode fibers (3.5&#xa0;μm core diameter). To minimize optical losses, most fiber components were fused. However, diffusive targets limit the amount of Doppler signal collected. A 532-nm multimode PDV system with 62.5&#xa0;μm core diameter fibers is compared through a long measurement for which alignment is not guaranteed.</p>

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532-nm Photonic Doppler Velocimetry

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年9月8日

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  • Y. Barbarin,
  • M. Le Gall,
  • B. Jodar,
  • T. Géral,
  • S. Bergey,
  • O. Chaumeil,
  • J. Bénier,
  • J.-M. Chevalier,
  • G. Bourcier,
  • C. Chauvin,
  • G. Le Blanc

摘要

Photonic Doppler Velocimetry (PDV) systems operating at wavelengths shorter than the classical telecom band are of interest for low-velocity measurements and for measuring smaller particles ejected from a material. As velocity resolution is proportional to wavelength, a PDV system at 532 nm (green) provides a theoretical threefold gain in precision compared to standard 1550-nm systems. First, we tested a 532-nm triature (push-pull) PDV system when the velocity reached was limited to a few hundreds of m/s in plate-impact and laser-shock experiments. Using the triature phase analysis increases the time resolution and compensates for the fact that the system is not frequency shifted. In order to measure higher velocities and possibly particles, another system was built with greater lasing power, a 200 MHz Acousto Optic Modulator and a faster photo-receiver. A surface velocity above 1000 m/s was measured. These 532 nm PDV systems were created with single-mode fibers (3.5 μm core diameter). To minimize optical losses, most fiber components were fused. However, diffusive targets limit the amount of Doppler signal collected. A 532-nm multimode PDV system with 62.5 μm core diameter fibers is compared through a long measurement for which alignment is not guaranteed.