4" CGH F/3,F/1.5,1/20 Wave For measuring cylindrical surface, CGHs are specially designed. •OptronStar uses interferometric techniques to verify the plano axis and power axis of the optic. These techniques include plano reference flats, Distance Measuring Interferometry and CGH diffractive elements. Mechanical attributes such as wedge are verified with micrometers or by optical methods. •A CGH diffractive null converts the plane wavefront from a transmission flat to a cylindrical wavefront. This can be used to measure convex or concave surfaces. Available coverage varies greatly based on the size and shape of the cylindrical surface.  

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