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In the realm of precision measurement and instrumentation, the Optical Glass Line Ruler has emerged as a game-changing tool that pushes the boundaries of accuracy and reliability. This innovative device harnesses the unparalleled clarity and dimensional stability of optical glass to create a ruler that sets new standards for linearity, repeatability, and durability.

In the realm of optical imaging systems, the accurate assessment of an instrument's resolving power is paramount. To meet this need, the United States Air Force (USAF) devised a pioneering tool in 1951 under the MIL-STD-150A standard: the 1951 USAF Resolution Test Chart. This microscopic optical resolution test device has since become a ubiquitous benchmark for evaluating the clarity and detail-capturing abilities of various imaging systems.

In the realm of precision optical metrology, Computer-Generated Holograms (CGH) have emerged as powerful tools for testing and measuring complex optical surfaces. Among these, CGH Cylinder Nulls have gained significant attention for their ability to accurately evaluate cylindrical surfaces. This article explores the principles, design, and applications of CGH Cylinder Nulls, emphasizing their role in advancing optical testing capabilities.

Computer-Generated Holograms (CGH) have revolutionized the field of optical testing, particularly in the measurement of aspheric surfaces. Among the various CGH techniques, CGH null correctors play a crucial role in ensuring high accuracy and reliability. This article delves into the principles, design considerations, and applications of CGH null correctors, emphasizing their significance in precision optical testing.