Polka-Dot Beamsplitters


A mirror-type (plate) beamsplitter is an optical window with a semi-transparent mirrored coating to break a beam into two or more separate beams. A beamsplitter will reflect a portion of the incident energy (see reflection %), absorb a relatively small portion, and transmit the remaining energy (see transmission %). Mirror-type beamsplitters have very neutral color characteristics and are often referred to as plate beamsplitters.

Material Optical Glass
Dimension Tolerance +/-0.1mm
Parallelism 3 arc min.
Surface Quality 80-50 scratch and dig
Bevel 0.1mmX45 degree
Coating Circle Aluminum(ALMgF2) Apertures
Reflect./Trans. Tolerance ±5%
Type 50R/50T; 70R/30T


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