FizCam 2000 Short Coherence Interferometers

Short coherence for plane-parallel optics & remote cavities.

A vibration-tolerant, surface-isolating Fizeau or highly accurate characterization of telescope optics, precision optics and prisms.


Measure plane-parallel and remote optics

FizCam 2000 – Short Coherence Interferometers

The FizCam 2000 Fizeau laser interferometer combines vibration tolerance, instantaneous phase measurement, the ability to isolate surfaces, and the ability to measure a remote Fizeau cavity or solid cavity, for highly accurate characterization of telescope optics, precision optics and prisms.

The FizCam 2000 short coherence interferometer (low coherence interferometer) simultaneously captures all phase data, allowing high-resolution measurement even in the presence of vibration and air turbulence. Its unique design allows instantaneous measurement of a wide range of optical components and systems.

The FizCam 2000’s proprietary laser source enables measurements which would otherwise be difficult or impossible to conduct. These include measurement of thin, plane parallel, transparent surfaces, such as those found in lithography mask substrates, and flat panel display glass. The system can also measure “remote cavities,” in which both the test and reference surfaces are physically separated from the interferometer, as when measuring large telescope and satellite optics.

Separating surfaces

One benefit of a short coherence source is that parallel surfaces can be separated from each other in the measurement. By using 4D Technology’s Path Matching feature, you can “dial in” a particular surface within a certain distance of the interferometer. On standard FizCams, the range is up to 400 mm (18 inches). On FizCam interferometers with the EP option, the range in which you can separate surfaces from each other is extended to 2 meters (78 inches).

Fizeau interferometer - short coherence to measure plane parallel optics

Plane parallel surfaces

Short Coherence Fizeau for measuring parallel glass surfaces closer than 300  microns (µm), remote cavity measurement, and thin optics.

dynamic Fizeau interferometer uses the polarization of light to measure all data simultaneously

Vibration Insensitive

Measure despite vibration and environmental noise.

Fizeau Interferometer mounts and optics

Mounts and Optics

Range of reference and return optics and mounts.

Fizeau Interferometer - 100mm aperture or 150mm aperature

Aperture Sizes

4 inch (100mm) and 6 in (150 mm).

What to expect

The FizCam 2000 is a vibration insensitive, on-axis, dynamic Fizeau interferometer, for high accuracy measurement of optical grade surfaces. Featuring a short coherence length source, the system enables measurement of parallel surfaces without the need for coatings to attenuate extraneous interference fringes.

The FizCam 2000 eliminates bulky and slow phase shifters by incorporating patented technology using a single camera, high-speed optical phase sensor that makes a wavefront measurement in as little as 150 microseconds. Because acquisition time is so short the FizCam can be used under almost any conditions, even for measuring moving parts, without vibration isolation.

The short coherence length source allows for measurement of close (< 0.3 millimeters) parallel glass surfaces. Other applications include remote cavity measurements, testing of index homogeneity, measurement of thin optics, and environmental chamber tests.

The FizCam 2000 12-inch is sold as a turnkey interferometric system:

  1. Interferometer
  2. Advanced software for taking measurements and analyzing the results
  3. Complete computer system
  4. Connecting cables and power supplies

Accessories can include:

  • Optical mounts
  • Reference optics
  • Linear table guides.

4Sight™ wavefront analysis software, included with every AccuFiz, features excellent ease of use and a short learning curve. 2D and 3D displays, filtering, thresholds and masking tools make it easy to highlight surface shape and texture. Zernike, Seidel, geometric and diffraction analyses are easy to perform. Comprehensive data sharing capabilities let you read, write, save and print data in many common file formats for comparison between instruments. Optional 4Front™ software enables real-time measurement for system alignment, and fast averaging of many datasets.


analysis software

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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