Posted in | Laser Interferometers

AccuFiz® Duo Fizeau: Dynamic Interferometer for Measuring an Expanded Range of Optics

The short coherence mode of the AccuFiz Duo facilitates dynamic on-axis measurements through patented technology. By employing a single camera and a high-speed phase sensor, it swiftly captures wavefront measurements in just 150 microseconds. This ensures highly accurate measurements, even in the presence of vibration and turbulence.

The short coherence length source allows for the measurement of plane parallel glass surfaces with a thickness as low as 0.2 mm, without requiring coating on either surface to eliminate unwanted fringes.

This technology finds applications in remote cavity measurements, testing index homogeneity, and testing in environmental chambers. An internal system, characterized by its speed and automation, enables rapid scanning to locate and isolate each surface efficiently.

AccuFiz® Duo Fizeau: Dynamic Interferometer for Measuring an Expanded Range of Optics

Image Credit: 4D Technology

The AccuFiz Duo features an additional long coherence source that uses a stabilized HeNe laser and operates with all the benefits of a standard phase-shifting Fizeau interferometer. This long coherence mode facilitates extensive cavity measurements and offers a spatial carrier dynamic mode for vibration and turbulence mitigation. It is also useful for standard radius of curvature measurements. The 632.8nm HeNe source facilitates measurements with digital holograms.

AccuFiz Duo Specs

Source: 4D Technology

. .
Configuration On-axis Fizeau interferometer
Acquisition Vibration-insensitive Dynamic Interferometry and Phase Shifting Interferometry
Source External  636 nm short coherence (~200 µm) source and 632.8 nm long coherence length stabilized HeNe
Camera 3K x 3K pixels; exposure 1 msec typical (1.5K x 1.5K pixels with long coherence source)
Controls Remote control focus, zoom, pan, extended source size, measurement
Zoom Continuous 1–10X  with pan, calibrated at all zoom settings
Software 4Sight™ Focus included
Size Small: Interferometer, 51.4 cm (20.2 in) long
Aperture 100 mm (4 in) or 150 mm (6 in); optional to 600 mm (24 in)


Measure a Broader Range of Optics in a Lab or Shop Floor

The AccuFiz Duo, with its vibration-insensitive short coherence mode and optional spatial carrier long coherence mode, excels in environments where other instruments falter. Employ the AccuFiz Duo seamlessly in the lab or directly on the shop floor to precisely measure:

  • Sapphire wafers, thin glass, and windows
  • Domes and other transparent, curved elements
  • Prisms, spheres, and flats
  • Polished semiconductor parts
  • Distant voids
  • Solid voids
  • Optical uniformity and thickness
  • Transfer of systems and components
  • Quick alignment of optical systems
  • Vacuum and environmental chamber testing

Large Aperture Options

Accessories for 4D large optics are fully compatible with the AccuFiz Duo. These mounts and beam expanders come in 12-inch (300 mm), 18-inch (450 mm), and 24-inch (600 mm) options, making it easy to handle and measure large optics.

Kinematic mounting allows users to use the interferometer with the accessories, remove it to use in stand-alone mode, and then return it to the beam expander without the need for any realignment.

AccuFiz® Duo Fizeau: Dynamic Interferometer for Measuring an Expanded Range of Optics

Image Credit: 4D Technology

Data Analysis Software

Introducing 4Sight Focus

All 4D interferometers and optical profilers come with the brand-new 4Sight Focus analysis software, which offers lightning-fast acquisition, vibrant graphics, and a plethora of analysis tools.

  • Fast acquisition and analysis
  • Clean, configurable interface
  • Easy to use
  • Deep analysis capabilities
  • Simple data output
  • Smart integration and automation

AccuFiz® Duo Fizeau: Dynamic Interferometer for Measuring an Expanded Range of Optics

Image Credit: 4D Technology

Fizeaus and Optical Production

The AccuFiz Fizeau is ideal for the manufacture of optics. 

Other Equipment by this Supplier

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