Application Note

Tech Note: Beam Splitter Coatings

Source: Abrisa Technologies

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Tech Note: Beam Splitter Coatings

By Abrisa Technologies

Beam Splitter is a term used to describe various coatings which divide a beam of light into separate beams. Dichroic filters, are often called beam splitters. However, we will be speaking specifically about beam splitters that divide light at each wavelength of interest into the two separate beams with an incident angle around 45 degrees from normal.

Dielectric coatings, have the advantage of being non-absorbing and so allow for greater throughput of energy. For example, a dielectric coating can be used for a 50/50 beam splitter coating. Inconel, on the other hand, can yield approximately 30% transmission and 30% reflection due to the absorption inherent in the metal film. Standard dielectric beam splitter coatings include 30/70, 50/50, and 70/30. However, at Abrisa Technologies, we will accommodate custom requirements that suit your application-specific need.

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Tech Note: Beam Splitter Coatings