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Computer-generated hologram
Computer Generated Holograms can be made to adjust the wavefront of a test item to a particular wavefront to make the testing process for a Fizeau interferometer to work with care. This may be used with a CGH added between a transmission sphere and the item to be measured. The distance has to be short to make the full aperture more useful. This uses a diffraction in a hologram to adjust the spherical test wave to make it all effective with a test process.The Optical Systems Division at Jenoptik makes CGHs that can be adjusted to measurement setups as needed. The holograms created can work with a quick process and works with a CGH test setup that can work with a good consultancy service. This is needed as not all aspherical shapes can work with CGHs. A holder may also be used for the substrate to make the control process as easy to manage as possible.