Fizeau interferometers are commonly used for measuring the shape of an optical surface: Typically, a fabricated lens or mirror is compared to a reference piece having the desired shape. In Fig. 1, the Fizeau interferometer is shown as it might be set up to test an optical flat. A precisely figured reference flat is placed on top of the flat being tested, separated by narrow spacers. The refer… Web开馆时间：周一至周日7:00-22:30 周五 7:00-12:00; 我的图书馆

CGH Positioners - Diffraction

WebAug 7, 2016 · CGH Used as Null Lens Laser Reference Surface Test Mirror Interferogram CGH Spatial Filter •Can use existing commercial interferometer •Double pass through CGH, must be phase etched for testing bare glass optics •Requires highly accurate substrate CGH Optical Testing Configurations -I CGH as null lens CGH in reference arm today minus 18 years

Modes of Communication: Types, Meaning and Examples

Webwavefront from an interferometer to an as pheric one that matches the shape of th e surface under test [1]. The CGH also performs another role. As an optical element, it relays the image of the surface under test to the interferometer. The CGH is optimized for wavefront performance, and not for good imaging. The first order effect of imaging ... WebPRO Tower 4i/6i Overview. The PRO Tower 4i/6i is a fast, ergonomical, and easy-to-use vertical interferometer capable of measuring the wavefront and radius of optics up to 300 mm in diameter. It has a motorized stage with 1,000 mm of travel and is available with a CGH stage for aspheric measurements. Multiple advanced features make the PRO … WebThis paper presents a new configuration that uses a computer generated hologram based Fizeau interferometer to make sub-aperture measurements on large secondary mirrors. … today minus 1 month in excel