COMPACT DIELECTRIC REFLECTIVE ELEMENTS .2. MULTICHANNEL FILTER OF CLOSELY SPACED SPECTRAL BANDS

The optical design of an interference wedge filter providing the simul taneous separation of a number of closely spaced spectral bands is stu died. Multiple reflections of the incident collimated beam within the wedge are initiated, each of them characterized by a different angle o f incidence and consequently by specific spectral parameters of the tr ansmitted band. Model calculations based on the measured angular depen dences of filter transmission parameters have been performed. The desi gn is proposed for applications in optical communications (wavelength division demultiplexing), analytical spectroscopy (minipolychromators) , color analysis, and similar areas.