On November 11, the "large-scale high-precision diffraction grating ruling system" project, one of the major national research projects for scientific research equipment undertaken by the Changchun Institute of Optics, Fine Mechanics, and Physics under CAS passed appraisal, and the system facilitated a successful ruling of echelle gratings with the largest size (400mm×500mm) the world had ever seen. Both the diffraction grating ruling system and the gratings lived up to leading international standards.

The achievement has put an end to the era when China relied heavily on others to provide such equipment and thus was subject to certain restrictions, and will provide core technology support to help improve China's competitiveness in the spectrometer industry.

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