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<p>In the present study, a two holographic lens (one recorded with interference of diverging spherical and planar wavefront, and another with converging spherical and planar wavefront) imaging configuration is applied in speckle photography and double aperture speckle interferometry. In double aperture speckle interferometry, aperture size controls the formation of speckle size, which ultimately affects the minimum measurable displacement. A larger aperture is required to lower the minimum measurable displacement. To overcome the limitation of the finite diameter of holographic lenses in the two holographic lens configuration, a suitably designed four holographic lens (two with interference of diverging spherical and planar wavefront, and the other two with converging spherical and planar wavefront) configuration has been applied to increase the overall aperture size and enhance the aperture separation. All the configurations are used to obtain monochromatic aberration free performance. Minimum measurable displacement value is reduced significantly (5&#xa0;μm) using a four holographic lens configuration compared to a two holographic lens configuration (30&#xa0;μm) reported in this study. The results obtained nearly match the actual displacement applied between two exposures.</p>

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Laser Speckle Photography and Speckle Interferometry Using Holographic Imaging Configurations

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Rahul Mandal,
  • Yashwinder,
  • Abhijit Ghosh,
  • A. K. Nirala

摘要

In the present study, a two holographic lens (one recorded with interference of diverging spherical and planar wavefront, and another with converging spherical and planar wavefront) imaging configuration is applied in speckle photography and double aperture speckle interferometry. In double aperture speckle interferometry, aperture size controls the formation of speckle size, which ultimately affects the minimum measurable displacement. A larger aperture is required to lower the minimum measurable displacement. To overcome the limitation of the finite diameter of holographic lenses in the two holographic lens configuration, a suitably designed four holographic lens (two with interference of diverging spherical and planar wavefront, and the other two with converging spherical and planar wavefront) configuration has been applied to increase the overall aperture size and enhance the aperture separation. All the configurations are used to obtain monochromatic aberration free performance. Minimum measurable displacement value is reduced significantly (5 μm) using a four holographic lens configuration compared to a two holographic lens configuration (30 μm) reported in this study. The results obtained nearly match the actual displacement applied between two exposures.