Beamsplitters - either as cubes or plates - can be used to separate incoming light in two intensities, polarizations or wavelength ranges. For analytical purposes a portion can be separated from the incident beam or a selected wavelength can be extracted from or coupled into the optical path. The variety goes from simple plates to sophisticated beamsplitter assemblies. Such components are typically customized and can include custom IP.
Used in the reverse direction, combiners converge two separate light beams into one beam while filtering a specific wavelength range from each incoming beam.