A BEAM SPLITTER

摘要

The present invention provides a beam splitter that comprising a body having at least one substantially flat surface. The surface has surface regions arranged to receive radiation at respective incidence angle ranges. At least some of the incidence angle ranges of the radiation received by the respective surface regions differ from one another and each surface region has a respective optical property such that the influence of the respective incident angle range on the wavelength range of reflected and/or transmitted radiation is reduced.