Optical protective film is a kind of functional film widely used at present, its main function is to protect optical components and improve the performance of optical devices. The optical protective film can reduce the influence of the optical element by the external environment and improve the service life and stability of the optical device. At the same time, the optical protective film can also increase the transmittance and reflectivity of the optical device, improve the optical performance and work efficiency of the optical device.

The main function of the optical protective film has several aspects, the first is the protective function. Optical protective film can prevent optical devices from being polluted and damaged by the external environment, such as dust, water vapor, grease, etc., so as to protect the cleanliness and integrity of optical devices. The second is corrosion resistance. The optical protective film can effectively resist the corrosion of chemical substances, acid and alkali and other corrosive substances on the optical device, and extend the service life of the device. The third is the dustproof function. The optical protective film can effectively reduce the dust accumulation on the surface of the optical device, and keep the transparency and optical performance of the device unaffected. In the back is the anti-slip function. The optical protective film can be firmly attached to the surface of the optical device to prevent it from falling off and peeling off, and maintain the integrity and stability of the device. There are two main preparation methods for optical protective film, namely physical vapor deposition and chemical vapor deposition. Physical vapor deposition is the process by which a solid material is heated to a high temperature, vaporized into a gaseous state, and then deposited onto the device surface by condensation to form a protective film. Chemical vapor deposition is the introduction of vapor precursor into the reaction chamber, through the reaction to form a gel, and then after heat treatment to form a protective film. Both of these methods can obtain high-quality optical protective films, but their process conditions and equipment requirements are slightly different. The materials of optical protective film are mainly inorganic materials and organic materials. Inorganic materials include silicon dioxide (SiO2), silicon nitride (Si3N4), gallium dioxide (Ga2O3), etc., with wear resistance, corrosion resistance, high light transmittance and other advantages. Organic materials include polymers, plexiglass, etc., which have the advantages of good flexibility and strong bendability. According to the requirements of different application scenarios, suitable materials can be selected to prepare optical protective films. The performance parameters of optical protective film mainly include transmittance, reflectivity, hardness, broadband transmittance and so on. Transmittance refers to the ability of optical devices to pass light, and reflectivity refers to the ability of optical devices to reflect light back. Hardness refers to the scratch resistance of the optical protective film, and broadband transmittance refers to the transmittance of the optical protective film in multiple wavelength ranges. The size and stability of these performance parameters directly affect the performance and efficiency of optical devices. The application range of optical protective film is very wide, mainly including optical components, optical instruments, optical equipment and so on. In the field of optical components, optical protective films are often used to protect and enhance the surface of lenses, prisms, filters and other components. In the field of optical instruments, optical protective films are often used for coating protection of microscopes, telescopes, lasers and other instruments. In the field of optical equipment, optical protective film is often used to improve the performance of optical fiber communication, photoelectric sensors, optical memory and other devices. The wide application of optical protective film not only improves the service life and stability of optical devices, but also improves the optical performance and working efficiency of optical devices. In short, optical protective film is a very widely used functional film, with protection, corrosion resistance, dustproof, anti-fall and other functions. The preparation methods of optical protective film mainly include physical vapor deposition and chemical vapor deposition. The materials of optical protective film are mainly inorganic materials and organic materials. The performance parameters of optical protective film mainly include transmittance, reflectivity, hardness, broadband transmittance and so on. Optical protective film has a wide range of applications, including optical components, optical instruments, optical equipment and so on. By using optical protective film, the service life and stability of optical devices can be improved, and the optical performance and working efficiency of optical devices can be improved.