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4D Technology, a subsidiary of Onto Innovation, announcedthe launch of the AccuFiz Duo Fizeau interferometer.

The AccuFiz Duo dynamic interferometer uniquely combines the industry leading AccuFiz D short coherence capabilities with long coherence capabilities into a single system. The AccuFiz Duo’s short coherence mode employs the same patented technology as the AccuFiz D, enabling vibration insensitive, on-axis, dynamic measurement for high accuracy measurement

of optical grade surfaces. With a short coherence length source, the AccuFiz Duo measures flats and lenses without the need for coating surfaces to attenuate extraneous interference fringes.

This mode enables surface error, transmitted wavefront error, remote cavity, wedge, optical thickness, and homogeneity measurements of plane parallel transparent surfaces down to 0.2mm thick.

The AccuFiz Duo’s additional long coherence source uses a stabilized HeNe laser and operates with all the benefits of a standard phase shifting Fizeau interferometer. The long coherence mode enables very long cavity measurements and has spatial carrier dynamic mode as an option 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 as well.

The AccuFiz Duo has the same compact, lightweight design of the AccuFiz D, with 2 sourcemodules to en le measurements on a broader range of optics in a lab or shop floor.

4D Technology’s user-friendly 4Sight Focus analysis software is common to both modes. 2D and 3D displays, filtering, and masking tools make it simple to quantify key surface shape; and Zernike, Seidel, geometric and diffraction analyses are all easy to perform.

The new AccuFiz Duo laser interferometer continues 4D Technology’s tradition of offering some of the world’s highest-performing interferometers, backed by industry-leading service and applications support.

Additional information can be found at

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