ASI
The Aspheric Stitching Interferometer (ASI®)
A metrology powerhouse capable of measuring even extreme aspheric departures
The ASI is the first commercial metrology solution that enables widespread use of aspheres -- even exceeding 200 mm in diameter and 1000 waves (650 microns) of departure from best fit sphere.
The ASI:
- Measures:
- aspheric optics up to 1000 waves (650 microns) of departure from best fit sphere - fast
- high-NA components with numerical apertures up to 1 (full hemispheres!)
- plano, convex, or concave surfaces up to and exceeding 200 mm in diameter
- Performs aspheric tests without null lenses
- Offers easy-to-use, automated, full-aperture metrology
- Gives you improved accuracy
- Provides improved lateral resolution, even allowing mid-spatial frequency metrology
- Enables the measurement of radius of curvature, asphere centration, and tilt
- Allows designers to use steep, complex aspheres to cost-effectively boost system performance
It automatically:
- Controls positioning
- Acquires and stitches the subapertures
- Calculates and compensates for errors (distortion, retrace, etc.)
- Provides accurate measurements of surface figure, pixel scaling, and radius of curvature
The ASI workstation also includes QED's patent-pending Variable Optical Null™ Technology.
Optional Equipment for the ASI
The QRc radius measurement system from QED Technologies is an optional feature for the ASI that enables precise measurement of the radius of curvature using a laser displacement measuring interferometer (DMI). To learn more about the QRc, download the New Product Bulletin from the QED Learning Center.
The QED Attenuation Filter increases the fringe contrast for high reflectivity parts, improves your measurements, resulting in better data and better parts. Available in 4” and 6” options, the QED Attenuation Filter can also be used on other interferometers, in either vertical and horizontal orientation and it fits any Zygo transmission spheres or flats. To learn more about the QED Attenuation Filter, download the New Product Bulletin from the QED Learning Center.
A. Kulawiec, M. Bauer, G. DeVries, J. Fleig, G. Forbes, D. Miladinovic, P. Murphy, "Subaperture stitching interferometry of high-departure aspheres by incorporating configurable null optics," Optifab 2009, Proceedings of SPIE Vol. TD06-44, May 2009.
Product List
ASI ® In Action
Introducing the Aspheric Stitching Interferometer (ASI ®)
