![]() The light hitting the surface will contain light at all angles between 35 degrees and 55 degrees. You may have an example where the AOI is 45 degrees with a ½ cone angle of 10 degrees (or + 10 degrees). The cone of light hitting the surface will contain a total of 40 degrees centered around zero.įor steering optics (mirrors and dichroics), this can become more complicated. For instance, a beam with an AOI of zero might have a distribution of angles (cone angle) of + 20 degrees. It is often expressed as a half cone angle in a tolerance. ![]() The cone angle describes the deviation of the AOI in a converging or diverging beam. In this case, the cone angle is also zero. Some light beams are collimated, meaning all the light is moving in the same direction These beams are not being focused or defocused. If the light beam comes in perpendicular to the surface, the AOI is zero. The AOI is the average angle at which the light hits the surface. This includes the angle of incidence (AOI), angle of reflection and angle of refraction. In optics, all angles are measured with respect to the normal (perpendicular to the surface). Our products ensure you get the best, most refined spectral response possible - but why not learn a bit more about the science behind this phenomenon? Angle of incidence and cone angle For those looking to optimize AOI and cone angle requirements, we suggest you read on - from steering optics to interference filters, this blog addresses the many different influences on AOI that might not be recognizable to the naked eye. Understanding AOI is an integral part of the filter-purchasing process. ![]() Design, Engineering and Manufacturing Capabilities.Longpass (LP) and Shortpass (SP) filters.
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