Broadband Plate Beamsplitters

These dielectric plate beamsplitters are multilayer coated to have an equal split ratio 50 ± 5 % over a broad spectral range.  As a result they are sensitive to polarization.  The s- an p- polarization states are reflected in different intensities but their combination provides equal transmission and reflection.

Four separate wavebands are available: 460 – 650 nm,  650 – 950 nm,  950 – 1250 nm,   1250 – 1650 nm .

Substrate material can be UV Fused Silica or BK7A optical glass.  Polish, stability and scatter are controlled as well as the precise reflectance of the multilayer dielectric coating.  In order to maintain a 50% split, the rear surface is anti-reflection coated  to achieve R<0.5% for the waveband of interest.

Broadband plate beamsplitters are normally produced on  λ/10 polished flats with a surface quality of 10/5 or better.  However, where flatness is not so important, thinner substrates can be used.  We therefore offer 2λ/25mm versions as well.

Broadband plate beamsplitters can be supplied in diameters of 25.4,  50.8, 76.2 mm , as 50.8mm squares or in any custom size.     

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