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<p>In the present work, we have proposed a design configuration of double aperture speckle interferometer consisting of two spatially separated identical hololenses recorded with diverging spherical and converging spherical wavefront. This configuration overcomes the aperture size limitations of a mask containing double apertures placed in front of the single hololens system. Whole lens area (hololens) treated as a single aperture area and hence two identical hololenses forming double apertures of speckle interferometer helps in achieving minimum measurable displacement value. Results obtained by the designed interferometer are presented and compared with the actual displacement applied to the object between the two exposures. It is observed that with the present design configuration, the minimum measurable displacement value is reduced (10&#xa0;μm) compared to our previously reported configuration, where a mask containing double apertures was placed in front of the hololens, recorded with diverging spherical and converging spherical wavefront (30&#xa0;μm).</p>

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Measurement of in-plane displacement using two identical hololenses

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Rahul Mandal,
  • Abhijit Ghosh

摘要

In the present work, we have proposed a design configuration of double aperture speckle interferometer consisting of two spatially separated identical hololenses recorded with diverging spherical and converging spherical wavefront. This configuration overcomes the aperture size limitations of a mask containing double apertures placed in front of the single hololens system. Whole lens area (hololens) treated as a single aperture area and hence two identical hololenses forming double apertures of speckle interferometer helps in achieving minimum measurable displacement value. Results obtained by the designed interferometer are presented and compared with the actual displacement applied to the object between the two exposures. It is observed that with the present design configuration, the minimum measurable displacement value is reduced (10 μm) compared to our previously reported configuration, where a mask containing double apertures was placed in front of the hololens, recorded with diverging spherical and converging spherical wavefront (30 μm).