BeamSplitter (BS) is a term used to describe various coatings which divide a beam of light into separate beams. Dichroic filters, covered in our Color Filter section, are often called beam-splitters. However, in this section, 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.

Beamsplitter

30%R, 70%T

This coating transmits 70% and reflects 30% (+/-10 %) from 450-650 nm at 45 degrees angle of incidence

Beamsplitter

50%R, 50%T

This coating is designed to transmit 50% and reflect 50% (+/-10%) from 425-650 nm at 45 degrees angle of incidence. May be applied to a flat plate or to the diagonal surface of a cube made from two right-angle prisms cemented together

Beamsplitter

70%R, 30%T

This coating reflects 70% and transmits 30% (+/-10%) from 450-650 nm at 45 degrees angle of incidence