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AccuFiz SIS

Surface Isolation Source for measuring plane-parallel optics.

Measure one or both surfaces of a transparent optic—without coating the surfaces. Transmitted wavefront error, optical thickness and homogeneity can be calculated, even on thinner materials.

Fizeau Interferometer - AccuFiz Surface Isolation Source for measuring plane parallel optics

Plane-parallel optics are transparent components with parallel faces, or systems with two or more parallel surfaces. Measuring any one surface with an interferometer is extremely difficult or impossible, as all parallel surfaces contribute fringes to the interferogram.

4D’s Surface Isolation Source is an optional, external laser source that excludes all but the surface of interest. The SIS module lets you measure both surfaces of a transparent optic with a standard AccuFiz interferometer. You can also calculate transmitted wavefront error, optical thickness and homogeneity, all from a single measurement setup.

The adjustable path match mechanism provides flexibility, letting you dial in any surface that is within 88 through 112 millimeters from the aperture.

AccuFiz SIS Specs

For use with AccuFiz Fizeau interferometers
Source Fiber-coupled short coherence
Wavelength 635-640 nm diode
Output Power 1–3 mW
Software 4Sight™ Focus included
Size 38.1 cm (15 in) long
Reflectivities 1 – 100% (attenuation required)




Introducing 4Sight Focus

The all-new 4Sight Focus analysis software—included with all 4D interferometers and optical profilers—provides blazing fast acquisition, rich visuals, and a wealth of analysis features.

  • Fast acquisition and analysis
  • Clean, configurable interface
  • Simple to learn
  • Deep analysis capabilities
  • Easy data output
  • Smart integration and automation.
4Sight Focus Customizable Interferometer Analysis Software

Fizeaus and optical production

AccuFiz Fizeaus are well suited to optics manufacturing.

  • Qualify shape and mid-spatial frequencies
  • Measure flats, spheres, cubes and mirrors
  • Wavefront transmission quality measurements
  • Fast and precise
  • Use in Aerospace, Semiconductor and Optics industries

Added Technical Resources


Setting the Wedge Factor Tech Note

The Wedge Factor scales results to account for the geometry of an optical test setup. This tech note explains how to set the parameter for measuring wavefront error and surface height in common configurations.

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