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Interferometric Testing

Interferometric Testing

Precision Optical utilizes a variety of interferometers (632.8nm, 1064nm) and interferometric techniques in order to meet the demands of the optics industry. From static fringe analysis on the shop floor, to ultra-precision measurements using both dynamic and temporal phase-shifting interferometers, Precision Optical relies on its interferometry to measure various optical specifications. Surface figure, irregularity, radii, transmitted wavefront error, aberrations, 90° angles, beam deviation (transmitted and reflected), wedge magnitude/parallelism, slope magnitude, and homogeneity testing are just some of the analysis that Precision Optical can perform. We can import/export the following dataset formats: 4D (.h5), Wyko/Veeco (.opd), Opticode (.map), MetroPro (.dat), CODE V (.int) or ESD, HDF4 (.HDF).

Precision Optical manufactures the majority of its own transmission and reference flats to better than lambda/50. With our 457.2mm reference flat we have the capability of measuring transmitted wavefront error and performing homogeneity testing over large apertures. We also have an AOS custom electronic tip/tilt mount capable of holding up to 660mm diameter optics. We manufacture our own tip/tilt plates and tooling for custom applications. We are very familiar with setups including: single-pass and double-pass prism testing, 90° internal and external measurements, parallelism, beam deviation, multiple-region analysis and homogeneity testing. RMS simple repeatability typically is on the order of lambda/10,000 and angular accuracy is ± 0.1 arc seconds.


  • • 4D AccuFiz on-axis dynamic with 609.6mm aperture (3K x 3K)
  • • Zygo ATZ Verifire phase shifting w MetroPro 9 and Mx, dual 152.4mm and 457.2mm apertures (1K x 1K)
  • • Zygo ATZ Verifire phase shifting w MetroPro 9 and Mx, with DMI radius slide and dual 152.4mm and 457.2mm apertures (1K x 1K)
  • • Apre S300 vertical wavelength shifting with 304.8mm aperture (2K x 2K)
  • • 4D Fizcam 2000EP dynamic with 152.4mm aperture (1K x 1K)
  • • (2) 4D AccuFiz phase shifting with 152.4mm aperture and dynamic capability (1K x 1K)
  • • 4D AccuFiz 1064nm phase shifting with 101.6mm aperture and dynamic capability (1.2K x 1.2K)
  • • 4D NanoCam Sq dynamic surface profiler with 20x Linnik objective (1K x 1K)
  • • (2) Wyko 6000 phase shifting interferometers with 4D upgrade and up to 304.8mm aperture (640 x 480)
  • • Zygo GPI-XP phase shifting interferometer with MetroPro 9 upgrade and 101.6mm aperture (640 x 480)
  • • Zygo Mark II phase shifting interferometer with 101.6mm aperture
  • • Mahr MarOpto FI 1100Z with 101.6mm aperture