POLARIZATION SEPARATION ELEMENT, POLARIZATION SEPARATION ELEMENT DESIGN METHOD, OPTICAL SYSTEM AND OPTICAL INSTRUMENT

摘要

To provide a polarization separation element, polarization separation element design method, optical system and optical instrument that deal with a broad range of an incidence angle by a simple multilayer film (laminate film) without requiring a structure birefringent layer.SOLUTION: A polarization separation element is formed between a pair of transmissivity substrates, in which transmittance of P-polarized light and transmittance of S-polarized light are different by at least B% or more in an entire wavelength segment from a wavelength A1 (nm) to a wavelength A2 (nm), where in a design wavelength λ (nm), A1=λ×0.86, A2=λ×1.7 and B(%)=22.5, and the polarization separation element has a dielectric body alternate laminate layer structure, and the dielectric body alternate laminate layer structure has at least a broad-band polarization separation film configuration, a first narrow-band polarization separation film configuration and a second narrow-band polarization separation film configuration.SELECTED DRAWING: Figure 2