A 660nm optical filter is an optical component that selectively modulates light at the 660nm wavelength. Its core function is to transmit or filter specific wavelengths of light through principles such as material absorption, interference, or diffraction. Based on spectral characteristics, 660nm optical filters can be categorized into bandpass, longpass, or shortpass types. Among them, the 660nm shortpass filter allows light in the 400-660nm wavelength range to pass while blocking longer wavelengths beyond red. It is widely used in fields such as photography and display technology.

Core Structure and Materials

• Structural Design: Commonly designed as a multilayer thin-film interference structure, wavelength selection is achieved through multiple reflections and refractions within the thin films. Alternatively, a diffractive design with surface-etched diffraction patterns may be employed.
• Substrate Materials: Typically made of glass or plastic, with the addition of special dyes or coatings (such as high-transmittance glass coatings) to ensure high transmittance and optical performance stability.