600nm narrowband filter main role is to make a specific wavelength of light through, so that reflects other wavelengths of light (or attenuation) of the optical element. Half-wave width is usually controlled at 20nm or smaller, ultraviolet, visible, near-infrared wavelengths, far-infrared wavelengths. Our narrow-band filters using multi subdural by ion assisted deposition of nano-materials made of high-vacuum evaporation, coating good compactness, high-resolution imaging. Advantages: Monolithic not use glue, plating dura, long life, wavelength positioning accuracy, ion deposition, temperature drift, penetration rate, high cut-off depth applications: fluorescence analyzer, microplate reader, cable upgrade equipment, wireless transmission equipment, mobile bar code scanning, infrared whiteboard, infrared camera, infrared touch screen, iris recognition, an infrared medical equipment, infrared ink identification, red film recognition, face recognition sensor system. Handheld infrared laser range finder, laser range finder, optical instruments, medical and health equipment and testing instruments.