The bandpass filter allows the optical signal to pass through a specific band, and the optical signals on both sides that deviate from this band are blocked. The passband of the narrow-band filter is relatively narrow, generally less than 5% of the central wavelength value.

The main function of the bandpass filter is to pass light of a specific wavelength and to reflect (or attenuate) light of other wavelengths. The half-wave width is usually controlled at 20nm or less, and can be used in ultraviolet, visible, near-infrared, and far-infrared wavelengths. Our company’s narrow-band filter is made of multilayer hard film by ion-assisted deposition of nanomaterials and high vacuum evaporation. The film layer Good compactness, high imaging clarity.