Narrowband interference filter is a narrow bandwidth, allowing light to pass through a particular band, let the rest of the long-wave band shortwave cutoff or reflective optics. Our multilayer bandpass filter using ion-assisted deposition of nano subdural Material from high vacuum evaporation, the film density is good, high-definition imaging. Application: fluorescence analyzer, microplate reader, cable upgrade equipment, wireless transmission equipment, mobile barcode scanning, infrared whiteboard, infrared cameras, infrared touch screen, iris recognition, infrared medical instruments, infrared ink recognition, red film recognition, Face recognition sensor system. Handheld infrared laser range finder, laser range finder, optical instruments, medical and health equipment and testing instruments. Optical indicators: center wavelength: 430nm ± 2 and a half bandwidth: 43nm peak through: T> 82% cut-off depth: T <0.1