White Light Interferometry

White Light Interferometry Services

White light interferometry (WLI), a type of coherence scanning interferometry, a class of optical surface measurement methods using the localization of interference fringes during a scan of optical path length as a means to determine surface characteristics such as topography, transparent film structure, and optical properties. WLI is currently the most common interference microscopy technique for areal surface topography measurement by utilizing spectral broadband, white light to achieve interference fringe localization.

Below, you’ll find more information about our white light interferometry services and common measurements using our Zygo white light interferometer.

APPLICATIONS FOR WHITE LIGHT INTERFEROMETRY:

Optical components, tribology, surface quality control, solar, medical devices.

MEASUREMENTS TAKEN WITH WHITE LIGHT INTERFEROMETRY:

  • 2D/3D surface mapping
  • Step height
  • Radius of curvature of optical surface or other surfaces
  • Profile slices
  • Slope analysis
  • Power spectral density (PSD) views
  • Built in SPC (pass/fail indicators) with automated region analysis to separate height, intensity, masking

EXAMPLE OUTPUTS OF WHITE LIGHT INTERFEROMETRY

Penny 3D measurement (White Light Interferometry): barely visible with the naked eye, the figure of Lincoln sitting in the monument is scanned in detail. 

Feature on a circuit board (White Light Interferometry)