Recently the research team of Zhang Xuejun, academician of Chinese Academy of Engineering, Key Laboratory of Advanced Manufacturing of Optical Systems, proposed a CGH (Computer Generated Hologram) detection accuracy calibration method based on equivalent surface, and realised the calibration of CGH compensation element of ultra-large aperture aspheric reflector using a small-diameter high-precision profilometer, with an accuracy of better than λ/150 (λ=632.8nm). Ultra-large aperture high-precision aspheric optical mirrors are the core components of high-resolution space-to-Earth observation, deep space exploration and astronomical observation systems, and their manufacturing technology level is of great significance for national defence security, national economic construction and basic scientific research capability.



   The surface shape of ultra-large aperture aspheric mirrors often requires nanometre-level accuracy, which puts ultra-high demands on the inspection tools that control the accuracy of their surface shape. Currently, the CGH-compensated interferometric inspection technique is the only inspection method with the highest accuracy in this field. By simulating the process of aspherical wavefront propagation, designing a small-diameter equivalent element that is fully equivalent to an ultra-large-diameter aspherical mirror in the self-collimating measurement optical path, and then adopting a small-diameter high-precision profile to detect the aspherical wavefront reference transmitted by the equivalent element, we have solved the difficulty of calibrating the accuracy of the CGH-compensated element of an ultra-large-diameter aspherical reflector.

   Yutai Optics offers a wide range of optical mirrors. Broadband dielectric mirrors offer near total reflection over a wide spectral range and are highly durable, while metal mirror coatings offer high reflectivity over the widest spectral region. Laser mirrors designed for lasers have damage thresholds appropriate for the laser specified. Optical mirrors such as hot mirrors, cold mirrors, back polished or polished mirrors, elliptical mirrors, concave mirrors, and flat mirrors with holes are available for more specialised applications.

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