Optical element and system.

摘要

An optical element has a dichroic layer (102, 103) on one surface thereof for wavelength selection of reflected light and transmitted light. The wavelength selection properties of the dichroic layer are polarisation dependent, and the transition region for the wavelength selection for P-polarised light and the transition region for the wavelength selection for S-polarised light both lie within the visible spectrum from 400 nm to 700 nm and do not overlap.