Arrowband filter

A narrowband filter is an optical component whose core characteristic is allowing only specific narrow-bandwidth light signals to pass through while effectively blocking other light signals outside this band. It typically has an extremely narrow passband width (generally less than 5% of the center wavelength), enabling precise selection of target wavelength light. It is commonly used in scenarios requiring high spectral resolution and strong anti-interference capabilities, such as spectroscopic analysis, fluorescence detection, and laser communication. Its performance is determined by parameters including center wavelength, bandwidth, peak transmittance, and cutoff depth, and it is relatively sensitive to changes in incident angle and temperature.