Ningbo Zhixing Optical Technology Co., Ltd. is exploring how CGH Null Correctors improve asphere testing accuracy by acting as diffractive null lenses, helping optical industries achieve more reliable measurement results.
Aspherical optical components are becoming increasingly important in industries such as machine vision, semiconductor equipment, precision instruments, aerospace optics, and advanced imaging systems. Unlike traditional spherical lenses, aspheres can correct optical errors more effectively while reducing system size and weight. However, their complex curved surfaces also create challenges during inspection and quality verification.
Traditional testing methods often struggle to measure aspheric surfaces because the curvature changes continuously across the lens. Even small measurement errors can affect the performance of the final optical system. This has created a growing demand for advanced testing technologies that can provide higher precision while maintaining efficiency.
Ningbo Zhixing Optical Technology Co., Ltd. focuses on optical precision components and customized optical solutions, including machine vision calibration boards, optical glass line rulers, photomasks, and advanced optical micro-nano processing products. Its expertise in optical design and precision fabrication supports the development of technologies that address these measurement challenges.
A Computer-Generated Hologram (CGH) null corrector is a specialized optical element designed to compensate for the unique shape of an aspheric surface during testing. In simple terms, it works like a customized optical translator that helps testing equipment “see” an asphere as if it were a standard reference surface.
When an interferometer tests a spherical lens, the reflected light naturally forms a predictable pattern. However, when testing an asphere, the reflected wavefront becomes much more complicated. A CGH element introduces a precisely calculated diffraction pattern to modify the light path, allowing the measurement system to compare the actual surface with the ideal design.
This function allows CGH Null Correctors to serve as diffractive null lenses (DNL), creating a controlled optical environment where complex aspheric shapes can be measured with exceptional accuracy.
A diffractive null lens does not rely on traditional glass curvature alone. Instead, it uses micro-scale diffraction structures created through advanced optical processing. These structures manipulate incoming light waves according to a designed pattern.
The working process can be understood in three steps:
| Testing Stage | Function of DNL Technology | Benefit |
|---|---|---|
| Optical design calculation | Creates a diffraction pattern matching the aspheric surface | Ensures accurate measurement preparation |
| Light wave correction | Adjusts the testing beam through diffraction effects | Reduces optical measurement errors |
| Surface comparison | Compares measured results with the original design data | Provides reliable quality evaluation |
Compared with conventional optical compensation methods, CGH-based solutions offer greater flexibility because the diffraction pattern can be customized for different aspheric geometries.
High-quality optical systems depend heavily on accurate surface measurement. A small deviation in an optical component may influence image clarity, positioning accuracy, or system stability.
For example, in machine vision equipment, calibration accuracy directly affects image recognition performance. In semiconductor inspection systems, optical precision influences the ability to detect extremely small features. For research instruments, reliable measurement ensures that optical designs perform according to expectations.
Ningbo Zhixing Optical Technology Co., Ltd. combines optical system design capabilities with precision processing experience to support customized solutions for different application requirements. The company’s technical team has experience in optical design, aspherical surface processing, and CGH production, helping address the challenges involved in advanced optical inspection.
The adoption of CGH technology brings several practical advantages:
Because the diffraction pattern is designed according to the exact surface shape, the testing process can identify tiny deviations between the manufactured component and the original optical design.
Every aspheric surface may have different parameters. Unlike standard testing tools, CGH solutions can be developed according to specific optical requirements, making them suitable for various precision components.
Accurate testing reduces repeated adjustments during optical production and helps engineers verify designs more efficiently.
As optical products become smaller and more sophisticated, precision measurement technologies become essential for maintaining consistent performance.
The demand for advanced optical measurement continues to grow alongside developments in automation, intelligent manufacturing, and high-resolution imaging. More industries are moving toward compact optical systems that require complex lens designs, increasing the importance of reliable asphere testing methods.
Modern CGH Null Correctors provide a practical approach by combining computer-designed diffraction technology with precision optical manufacturing. They bridge the gap between theoretical optical design and real-world production inspection, allowing engineers to evaluate complex surfaces with greater confidence.
Future developments in optical processing, computational design, and micro-nano fabrication are expected to further improve the capabilities of diffractive optical testing. Technologies such as machine vision calibration boards, precision targets, and optical measurement components will continue to play an important role in supporting these advancements.
As optical systems continue evolving, accurate measurement remains a key factor in achieving reliable performance. CGH-based diffractive null lens technology provides an effective solution for testing challenging aspheric components, making advanced optical inspection more accessible and practical.
With its focus on optical devices, precision processing, and customized solutions, Ningbo Zhixing Optical Technology Co., Ltd. continues to contribute to the development of optical technologies. Its products, including CGH Null Correctors, Machine Vision Calibration Boards, Optical Glass Line Rulers, and Photomasks, reflect the company’s commitment to supporting higher standards in modern optical measurement and manufacturing.
