CGH补偿检测光学元件设计与加工 - 知乎
2023年6月15日 · MacGovern 和J. C. Wyang提出在干涉测量中使用计算全息 (Computer Generated Holograms, CGH)对非球面进行检测，随后该技术在高精度光学元件检测（非球面、自由曲面、柱面镜等）中得到了…
关于光学检测用计算全息 (CGH)及其基础知识 - ZEMAX - 吾爱光设
2020年12月11日 · 该检测方法与零位补偿器检测法相同，通过计算全息图的光学波前被全息条纹衍射成为一束相位被“整形”的光学波前，变成与待测光学表面形状一致的光学波前，实现零位补偿功能， 为光学元件面形检测提供了全新的零位检测手段。 由于计算全息是依赖于微电子加工技术的一种衍射光学元件，因此其加工精度极高，相应零位补偿精度也得到保证，因此能够实现各类曲面的实时高精度检测。 在之前，CGH一直被业界认为是高精尖领域才能应用的技术，成本高昂 …
Design, fabrication and characterization of Computer …
2017年12月21日 · In this paper, we present the design, fabrication and optical characterization of computer-generated holograms (CGH) encoding information for light beams carrying orbital angular momentum (OAM).
(PDF) Computer generated holograms: Fabrication and application …
2008年9月1日 · Computer-generated hologram (CGH) is a diffractive optical element that has been commonly used as wavefront corrector in the interferometer and can be accurately...
Using computer-generated holograms to test cubic surface
2009年6月15日 · Computer-generated holograms (CGH) have been widely used to evaluate symmetrical aspherical surfaces in combination with Fizeau interferometers. Because the CGH can create any wavefront shape, it can also be used in unsymmetrical aspherical surfaces testing.
The Optical Design of Cubic Phase Plate Testing System
Computer-generated holograms (CGH) have been widely used for years in optical testing of aspheric surfaces in combination with Fizeau interferometers. With the
The Design of Computer-Generated Holograms for Testing Unsymmetrical ...
A CGH for testing a cubic phase plate with duty cycle 0.5 is fabricated by using e-beam lithographic techniques. In this situation, the contrast of the interference fringe pattern can achieve a level of 99.4% by calculation.
CGH TEST PLATES Convex spherical surfaces are commonly measured with matching concave test plates. When the test plate is sup-ported near the convex optic and illuminated with suf. iciently coherent light, fringes of interference show the shape dif-ference between the two parts.
Optical design for unsymmetrical aspherical cubic phase plate …
As one of the most promising methods in all the interferometric null tests, computer-generated holograms (CGH) can also be used in unsymmetrical aspherical surfaces testing. Taking the cubic surface as an example, the principle of testing unsymmetrical aspherical surfaces with …
Typical CGH plates are consist of a main CGH to compensate the aspheric wavefront from the test optics and a few alignment CGHs to align the interferometer, CGH, and the test optics. Fig. 1...