Plate-shaped beamsplitters are dielectric multilayer coatings on a parallel plate or wedge-shaped substrate. Reflectance : Transmittance: 1:3
Harmonic separators are used to separate certain YAG harmonics from other harmonics.

OSE-BS4

A beam sampler behaves like a plate beam splitter, it has the ability to reflect approximately 5.2% of the total beam.