520-294-5600 4dinfo@nanometrics.com

Fizeau interferometers

Fizeau interferometers offer an unmatched combination of performance, quality and value in optical metrology. They produce accurate, repeatable interferometric measurements of surface shape, radius of curvature and transmitted wavefront quality.

4D’s Fizeau interferometers have continually led the field for high performance and innovation.  4D’s product family includes the first vibration-immune Fizeau systems, a high resolution option for measuring steep slopes and asphere, short coherence source models for measuring plane-parallel optics, and a vast array of mounts and accessories.  With available wavelengths from 193 nm through 10.6 microns, apertures from 33 mm to 800 mm, and industry-leading analysis software, 4D Fizeaus beat all other systems for value, flexibility and long-term investment value.

 AccuFiz Fizeau laser interferometers fit well in confined lab spaces. The compact, lightweight design is extremely rigid for high stability in any orientation or environment.

Full range and fully developed accessories selection

Order AccuFiz Fizeau interferometers in wavelengths from 355 nm through 1.064 µm. The standard product has apertures from 33 mm to 800 mm and can be mounted horizontally or vertically. 4D’s mature line of product offerings and accessories provides the right options for a wide range of applications and budgets.

High resolution for steep slopes and aspheres

The optional 6 megapixel, high resolution camera captures the highest slopes of any commercial interferometer. With high slope range capability, you can have optical metrology of aspheres, freeform optics and highly aberrated elements.

Isolate plane-parallel surfaces

One common shortcoming of the long-coherence laser in Fizeaus is the inability to measure plane parallel surfaces. The Surface Isolation Source (SIS) option adds the ability to measure plane-parallel optics without coatings or back-surface treatments. It eliminates unwanted second-surface reflections. Quantify shape, optical thickness, transmitted wavefront error, and homogeneity on optics as thin as 300 µm.

AccuFiz Visible and NIR Fizeau Interferometers

100 mm and 150 mm aperture models are provide industry-leading repeatability at wavelengths from 355 – 1550 nm.

Rigid for best results, anywhere

Maximum stability is essential for optical metrology, and these interferometers will operate successfully in any orientation or environment. The AccuFiz Fizeau’s compact, lightweight design is extremely rigid.

Accurate lateral resolution

No more recalibrating lateral dimensions when you zoom. Only AccuFiz includes Smart Zoom™ to ensure accurate lateral resolution over the entire 1X–10X zoom range.

AccuFiz 6MP High Resolution Fizeau Interferometers

The AccuFiz 6MP laser interferometer provides the highest available resolution for measuring steep slopes, aspheric surfaces and small diameter optics. Its 2400 x 2400 pixel sensor doubles the measurable spatial frequency range and quadruples the sampling capability of standard Fizeau interferometers.

AccuFiz (SIS) – Surface Isolation Source in a Fizeau Interferometer

Plane-parallel optics are transparent components with parallel faces, or systems with two or more parallel surfaces.  When reflections from the surfaces combine they contribute unintended interference, making measurement extremely difficult or impossible.

The AccuFiz SIS Surface Isolation Source eliminates reflections from all but the surface of interest, so you can measure each surface quickly and easily. You can even measure homgeneity and optical thickness, all in a single measurement setup.

AccuFiz Large Aperture Interferometers

High performance aperture converters and mounts let you leverage the performance of a standard AccuFiz to measure optics up to 800mm in diameter. Kinematic mounting allows to an AccuFiz for both large aperture measurement and stand-alone operation. with no need for re-alignment.  A 4D aperture converters turns your AccuFiz into a flexible, cost-effective system for all of your shop measurements, large and small.

AccuFiz Infrared Wavelength Fizeau Interferometers

4D IR Fizeau interferometers provide consistently high performance, quality and value for accurate, repeatable measurement at infrared wavelengths. Laser sources wavelengths from 1.55 µm through 10.6 µm enable measurement of IR components and systems at their functional wavelength, as well as measurement of rough polished optics. Internal optics and accessories to match.

Near Infrared (NIR) wavelengths are available as well, including 1.053 and 1.064 µm.

AccuFiz IR interferometers are available in these wavelengths:

  • AccuFiz SWIR, operating at 1.55 µm
  • AccuFiz MWIR, operating at 3.8 μm
  • AccuFiz LWIR, operating at 10.6 μm
  • AccuFiz DBIR, operating at both 3.8 μm and 10.6 µm sources, for cost-effectiveness and flexibility.

Short Coherence Laser Interferometers

FizCam dynamic short coherence laser interferometers are designed for challenging measurements such as remote cavities, simultaneous measurement of multiple glass surfaces. They also perform measurements in environmental testing chambers and provide an analysis of moving parts. With acquisition time under 1 millisecond and a completely on-axis design, FizCam systems provide extremely accurate measurement in a lab or in noisy environments, such as production floors and cleanrooms.

FizCam 2000 4″ and 6″ Aperture

The FizCam 2000 Fizeau laser interferometer combines vibration tolerance, instantaneous phase measurement, the ability to isolate surfaces, and measure a remote cavity or solid cavity. With them, you characterize telescope optics, precision optics and prisms with high accuracy.

FizCam 2000 12″ Fizeau Laser Interferometers

The FizCam 2000 12 inch aperture Fizeau laser interferometer combines vibration insensitivity and instantaneous phase measurement for highly accurate characterization of large optics including telescope lenses and mirrors.

Fizeau Accessories, Mounts and Optics

4D optical mounts and other accessories provide the flexibility and reliable, worry-free operation you need to complete your optical setup. Whether you require a highly repeatable test rig for production measurement or a complex setup for a unique measurement, 4D mounts and accessories will help you maximize measurement accuracy and minimize alignment and setup time.

In addition to optical mounts and accessories, we offer a range of options for radius of curvature measurements from slides to automated systems.

Get In Touch

(520) 294-5600


3280 E Hemisphere Loop, Ste 146
Tucson, AZ 85706



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