Friday, 10 Jul 2020

Everything You Need to Know about Anti-Reflection Coating

Anti-reflective coating or also known as AR coating is a kind of optical coating that is applied to the lenses surface and other elements optical dimension to reduce reflection. The main purpose of this kind of optical coating is to decrease the reflectivity of an object. Generally, there are several factors that affect or lessen the reflectivity of an object and they all depend on the AR coating’s composition. Regardless of the variance, some of the methods used in creating AR coating include the design of AR that affects the ultraviolet rays of the sun and infrared light, transmission of desired spectrum because of the blocked light wavelengths, blocking of greater range of light and layering the opposing reflective index materials.  

When considering optical coatings and AR coating types, It is crucial to totally understand the relationship between light wavelengths and coating. Understanding so will help you make the right decision as to the right type of AR coating that you need for a particular application. You can check some related information online about high quality anti reflection coating and its relationship with the light wavelengths. 

Furthermore, it is also important to know the types of anti-reflection coatings. This will also help you choose the right coating type for an application that you are currently working on. Some of the common types of AR coatings include thin film, thick film, and thin-film interference. Thin film is an AR coating that reduces reflectivity at one quarter of the wavelength light. On the other hand, thick film is used to increase thick film coatings. Basically, the effect of coating in reflectivity determine the wavelength of light and the angle at which coating surface is hit by light. Last type of AR coating is thin film interference. This kind of coating occurs when the upper and lower layers of AR coating reflect incident light waves. 

As mentioned earlier, the main goal of AR coating is to reduce reflection. But apart from that, AR coatings are also designed to block wide variety of light spectrums. Some of the common spectrums of light are broadband, narrowband, dual band. High efficiency coatings block infrared light. On the other hand, broadband coatings reduce reflectivity over a wide range of wavelengths. As such, the accurate light spectrum will determine the right kind of coating. This is why you should learn the differences between each kind of coating.

Lastly, you should also know the common application of AR coatings. First, AR coating is used in the field of planetary astronomy. AR coatings are used in order to reduce the telescopes and microscopes reflection and also eliminate stray light. Second, AR coatings are also used in reducing glint for the viewer that uses binoculars. This will help them to have a clearer view of the object or subject that they are looking at. AR coatings are also sued in the field of micro electric photolithography. These are sued to minimize or decrease the distortions of images.