Sapphire glass is primarily utilized for the fabrication of mirror surface, and numerous manufacturers must exercise caution during the production process, particularly in the polishing process. If conducted improperly, this can result in significant financial losses and have a detrimental effect on the reputation of the corporation. During the process of preparation, the sapphire window may exhibit a slight coloration, a phenomenon that is predominantly contingent on the purity of the raw material and the process parameters used during the preparation procedure. The presence of trace impurities, such as iron, titanium and other elements, in the sapphire material may result in alterations to the color of the window. In addition, processing technique and polishing during preparation may also have an impact on the color.

Nevertheless, the light coloration of the sapphire window does not have a significant impact on its optical performance. Sapphire still exhibits excellent light transmission and optical properties, and is capable of transmitting light in the visible and near-infrared wavelength ranges. Consequently, in the absence of specific requirements for a particular application, a minor deviation in color is unlikely to have a substantial impact on the functionality and performance of sapphire glass. If the yellowish color is not acceptable for a particular application, a high-purity sapphire material can be selected or the window color can be improved through subsequent processing and treatment. This may include further fine polishing or the application of special optical coatings to adjust the color.

The grinding process of sapphire glass is typically divided into three stages: rough grinding, fine grinding and polishing. Rough grinding ensures a uniform surface, while fine grinding further enhances its smoothness. It is evident from the aforementioned processes that the polishing process of sapphire window is, in fact, a process of etching and purging to achieve the ideal state, and the purpose of sapphire polishing is to achieve the mirror effect of each part of the sapphire window (lens).

Sapphire is a hard, scratch-resistant material that is frequently used in applications where high durability and wear resistance are paramount. It possesses exceptional optical properties, characterized by high transparency and minimal light scattering. Sapphire glass is an ideal material for use in lenses, windows and other optical components. Despite the high initial cost, it is a cost-effective material for many applications due to its long-term durability and low maintenance requirements.