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Polarizing beam splitting element, comprising: a blank lens, a coated lens and a light-curing adhesive layer. The coated lens includes a base material, an optical interference body formed on the base material, and a protection formed on the optical interference body film, the protective film contains at least one dielectric layer, and the dielectric layer is formed of a material selected from the group consisting of aluminum oxide, magnesium oxide and magnesium fluoride; the photocurable adhesive layer is formed on the Between the blank lens and the protective film of the coated lens, the polarizing beam splitting element of the present invention forms the protective film on the optical interference body of the coated lens to effectively block the infiltration of the photocurable adhesive composition. The optical interference phenomenon produced by the coated lens will not be destroyed, and the transmittance of the polarizing beam splitting element will not be greatly reduced. In addition, the present invention also provides a kind of composite polarizing beam splitting element made by superimposing a plurality of the above-mentioned polarizing beam splitting elements. Spectroscopic mirror.
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