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Notch filters
Notch filters work primarily on the principle of thin film interference or absorption. The notch filter based on thin film interference is based on the optical film of different refractive indexes alternately plated on the substrate material, and the light of a specific wavelength cancels each other to achieve high reflection by using multiple reflections and interference of light between the film layers. Filters based on the absorption principle rely on special materials to selectively absorb light of a specific wavelength to achieve the notch effect.
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