CGHs generate almost any wavefront and expand the possibilities of the interferometer for testing form deviations of any optical surface. They also provide optimum results for the alignment of optical elements and testing of lens centration.

A CGH (Computer Generated Hologram) is an optical null element that creates a unique wavefront enabling interferometric testing of complex optical surfaces including freeform, gullwing and off-axis aspheric shapes.

Computer Generated Holograms (CGHs) provide an effective means of quantifying the surface irregularity of aspheric lenses by converting spherical reference wavefronts into aspheric wavefronts that match the surface sag of the asphere.

2020年12月16日 · The use of phase and especially amplitude computer-generated holograms (CGHs) instead of refractive lenses makes it possible to reduce errors in the generation of the reference wavefront at a much lower CGH cost compared to refractive lenses.

CGH stands for Computer Generated Hologram. It is an optical lens that is used in interferometric measurement of complex surfaces, such as aspheric optics or freeform optics. CGH is designed using computer algorithms and then manufactured via optical lithography.

cgh 代表计算机生成的全息图。 它是一种光学透镜，用于复杂表面的干涉测量，例如非球面光学或自由曲面光学。 CGH 使用计算机算法设计，然后通过光刻制造。

Computer-generated holograms (CGHs) are customized optical components integrated into standardized size and mechanical interface formats. CGHs consist of a fused silica substrate in which the diffractive pattern is printed or etched. Substrates in 3-inch, 6-inch, and 9-inch square formats to suit a range of test optic sizes.

Precision alignment with multi-zone CGHs: Our multi-zone CGHs are perfect for aligning optical elements in space with an accuracy of a few µm. If a lens is in the correct position and orientation, an interference pattern is generated via the associated CGH zone. The alignment is done by optimizing the interference signal.

2020年9月5日 · Computer Generated Holograms (CGH) in combination with Fizeau interferometers are widely used as a proven and established tool to inspect aspheric surfaces, cylindrical lenses and free-form surfaces with the highest precision. Aspheres with an additional diffractive structure can also be tested.

Computer-generated holography (CGH) is a technique that uses computer algorithms to generate holograms. It involves generating holographic interference patterns. A computer-generated hologram can be displayed on a dynamic holographic display, or it can be printed onto a mask or film using lithography. [1]