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AccuFiz Large Aperture Accessories

Measure optics to 600 mm diameter with the resolution of a standard interferometer.

Take advantage of the high wavefront quality and reliability of a standard AccuFiz to measure large flats and large-diameter curved surfaces—and small to mid-sized optics as well.

4D Technology AccuFiz 600 mm Beam Expander and Mounts

Measure Large AND Small Optics with One Instrument

AccuFiz Large Aperture Converters

4D compact, high performance aperture converters produce collimated test beams of up to 600 mm diameter. Kinematic mounting makes it possible to quickly remove the AccuFiz for stand-alone operation, measuring a wide range of flat and focal optics throughout the shop. Then, return the instrument to the aperture converter to measure larger optics, with no need for re-alignment. The system can be used in horizontal or look-down configurations to maximize flexibility.


Reliable, Repeatable Optics Mounts

4D mounts provide highly repeatable tip and tilt of the test and/or reference optics. The mounts accept either sling-mounted flats, which are set in removable handling cells that provide precision, 360-degree rotation, or potted flats which can be rotated in 60 degree increments.

The 4D phase-shifting tip/tilt mount includes a piezo-actuated phase shifter for shifting the reference temporal measurements when an aperture converter is employed. 

A range of transmission and return flats are available, with λ/10 or λ/20 wavefront quality.

Everything Included

A large aperture AccuFiz interferometer system includes:

  1. AccuFiz 100 mm interferometer
  2. Kinematic aperture converter
  3. Motorized tip/tilt mounts for transmission and return optics
  4. Piezo-controlled mount for shifting the reference for temporal measurements
  5. Visible alignment laser system
  6. Complete computer system
  7. Connecting cables and power supplies.

Considerations in designing very large aperture interferometers

Learn how modern materials, design methods, and software can reduce complexity, improve precision and repeatability, and greatly enhance the usability of large-aperture Fizeau interferometers.

Download the white paper using the form above.




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.

  • Large optics, both flats and spheres
  • 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.

Get In Touch

(520) 294-5600


3280 E Hemisphere Loop, Ste 146
Tucson, AZ 85706


Office Hours (Arizona Time)

Mon: 8am - 5pm
Tue: 8am - 5pm
Wed: 8am - 5pm
Thur: 8am - 5pm
Fri: 8am - 5pm
Sat: Closed
Sun: Closed

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