The narrowband 470nm filter is an optical component designed based on the principle of interference effects. It utilizes vacuum deposition technology to alternately deposit high/low refractive index materials (such as TiO? and SiO?) on the substrate surface, allowing only light within the 470nm center wavelength ± full width at half maximum (FWHM) range to pass while blocking stray light from other wavelength bands. Its core function is to achieve high-precision spectral selection, making it suitable for applications with strict requirements for the blue light band, such as fluorescence detection and biomedical imaging.

Key Technical Parameters of the Narrowband 470nm Filter

• Center Wavelength (CWL): 470nm, which determines the core transmission band of the filter and must precisely match the wavelength of the target light source.
• Full Width at Half Maximum (FWHM): Typically less than 50nm (narrowband type), ensuring high suppression of non-target wavelengths and improving signal purity.
• Blocking Depth: Expressed as optical density (OD value), generally requiring OD ≥ 4 (transmittance < 0.01%), effectively attenuating interference from ultraviolet, infrared, and other visible light.
• Transmittance: Peak transmittance is typically > 80%, ensuring efficient utilization of the target blue light.