The following editor will share about the impact of the use of coatings on optical lenses? content, welcome to read!
What are the effects of using coatings on optical lenses?
Generally speaking, when light passes from one substance to a different transmitting substance (such as air into optical glass), 5% of the light is reflected. In a complex optical system, due to numerous lenses and refractors, the overall transmittance of the entire system can only be 50% or lower.
Therefore, people apply a single-layer anti-reflection coating (usually MgF2) or a multi-layer anti-reflection coating on the surface of the optical lens. The single-layer anti-reflection coating can reduce the reflectivity to 1.5%, and the multi-layer anti-reflection coating can reduce the reflectivity to 0.25%, thereby greatly improving the optical transmittance of the system in a specific wavelength band.
You can usually tell what coating an optical lens is coated with by the color reflected on the lens. Lenses coated with a single-layer AR coating are usually blue-violet or red, and lenses with a multi-layer AR coating are light green or dark purple.
Precautions for coated optical lens in laser environment:
With the continuous development of laser science, more and more optical experiments and work revolve around lasers, especially the wide application of high-energy lasers in scientific research, making the laser damage threshold of coating components one of the indicators that researchers pay special attention to .
The factors that affect the laser damage threshold are as follows:
(1) It is closely related to the performance of the medium itself, including the composition of the medium, optical uniformity, optical absorption, thermal properties, etc.;
(2) It is related to the properties of the irradiated laser, including laser frequency, laser pulse width, laser beam spot, etc.;
(3) It is related to the processing process of optical components, such as the processing traces left on the optical components, the coating method, the purity of the film material, etc. Even the cleanliness of the experimental operating space will also affect the damage of the medium.
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