The Computer-Generated Hologram (CGH) serves as a master wavefront transformer in modern optical metrology. Manufactured by Ningbo Zhixing Optics Co., Ltd., these CGHs leverage precision computational design and micro-nano fabrication to convert the standard wavefront of an interferometer into a customized compensating wavefront, thereby enabling nanometer-level null testing of complex optical surfaces.

Schematic Diagram of CGH Operating Principle

Zhixing Optics' CGH metrology solutions extend beyond individual optical elements to address precision testing requirements across diverse industrial applications, providing comprehensive technical support spanning from design through implementation:

      ● Consumer Electronics: Targeting hybrid glass-plastic smartphone lenses and VR/AR Pancake modules, these solutions enable surface figure testing and mass-production consistency control for high-order aspheres and freeform surfaces.

      ● Automotive Electronics: Providing high-throughput metrology solutions for the inspection of glass-molded aspheric lenses and head-up displays (HUDs).

      ● Aerospace: Supporting the alignment of off-axis three-mirror anastigmat (TMA) systems by enabling precision null testing of large-aperture aspheric and off-axis optical surfaces.

      ● Semiconductor: Serving critical optical components in semiconductor manufacturing equipment to meet nanometer-level surface figure evaluation requirements in vertical metrology configurations.

Applications of CGH Across Industries

      High-quality CGH elements serve merely as the foundation for high-precision metrology; the true technical challenge lies in error control during system integration. Through independent R&D, Zhixing Optics has achieved a closed-loop technical solution spanning from mechanical compensation to algorithmic correction:

1. High-Precision Metrology Fixture Solutions:

       To address position and orientation sensitivity in aspheric and freeform surface testing, we possess in-house capabilities for the design and fabrication of ultra-precision fixtures. By developing mechanical structures with high repeatability and integrating hexapod linkage algorithms, we minimize system alignment errors, thereby ensuring the authenticity and reliability of measurement data under complex optical configurations.

2. Proprietary Distortion Correction and Data Reconstruction:

       In off-axis and complex surface measurements, optical distortion frequently causes geometric warping of the measured maps. Zhixing Optics has developed dedicated distortion correction software that accurately reconstructs raw measurement maps based on the spatial relationship between the CGH and the test optic. By restoring true surface figure data within the physical coordinate system, this capability provides high-confidence feedback to facilitate rapid iteration of downstream manufacturing processes.

Examples of Ultra-Precision Fixture Design

Distortion Correction Software Interface