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Topographic optical profilometry by absorption in liquids.

Juan Carlos Martinez Antón1, Jose Alonso, Jose Antonio Gómez Pedrero

  • 1Departamento de Óptica, Escuela Universitaria de Óptica, Universidad Complutense de Madrid, C/. Arcos de Jalón 118, 28037, Madrid, Spain. jcmartin@fis.ucm.es

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Summary
This summary is machine-generated.

This study introduces a new photometric probe using optical absorbance in a liquid to measure surface topography. The method reliably profiles height distribution, even on steep slopes, achieving nanometer resolution for complex optical surfaces.

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Area of Science:

  • Optical metrology
  • Surface characterization
  • Photometric techniques

Background:

  • Measuring the topography of complex optical surfaces, such as micro-optic arrays and free-form lenses, presents significant challenges for conventional optical methods.
  • Existing techniques often struggle with steep surface slopes and require specialized setups.

Purpose of the Study:

  • To develop a novel, reliable, and adaptable method for measuring the 3D topography of optical surfaces.
  • To address the limitations of current techniques in profiling complex and steep optical surfaces.

Main Methods:

  • Utilizing optical absorbance within a liquid as a photometric probe to measure surface topography relative to a reference surface.
  • Comparing transmission images at two different wavelengths to determine height distribution.
  • Tailoring the height measurement range by adjusting the concentration of water-soluble dyes.

Main Results:

  • The method successfully profiles height distribution with nanometer resolution.
  • It demonstrates robustness in handling steep surface slopes (up to 90°) without difficulty.
  • The technique is adaptable to various fields of view and height ranges (peak to valley).

Conclusions:

  • The developed photometric probe offers a simple, reliable, and versatile tool for 3D surface profiling of transparent optical components.
  • It is particularly well-suited for challenging geometries like micro-optic arrays, Fresnel lenses, aspheric, and free-form lenses.
  • Experimental validation confirms its capability as a metrological tool for complex optical surface characterization.