Abstract: A beam splitter array includes first and second beam splitters and a reflector to reflect part of a beam from the second splitter. The first splitter outputs a first beam having a power spectral density comprising a substantial portion of a white light spectrum from a first output port, and a second beam of optical radiation having a power spectral density comprising a substantial portion of a first non-white spectrum and a substantial portion of a second non-white spectrum from a second output port, from an input beam received at a first angle of incidence. The second splitter receives the second beam at a second incidence angle, and reflects a substantial portion of the second beam having a power spectral density comprising the first non-white light spectrum, and transmits a substantial portion of the second beam having a power spectral density comprising the second non-white light spectrum.