Definition of Bandpass Filters Bandpass filters are designed to isolate a region of the UV,visible,infrared spectrum. This is accomplished using a complex process of constructive and destructive interference.Band pass filters have bandwidths (measured at half-peak transmittance levels) less than 6% of the center of wavelength value.Our bandpass optical filters and narrow bandpass filters are coating on transparent optical glass or colored optical glass.FWHM is full width at half maximum.CWL means center wavelength Part No：NBF-1064W10 Name：1064nm narrow bandpass filter Application：laser machine Feature：narrow bandwidth Feature：K9 glass Size：custom design，T=2.0mm Optial parameter CWL：1064±2nm，T≥80%，FWHM：10±2nm，Blocking：OD4@200-1200nm