What is the bandwidth of a band pass filter?
Bandwidth of Optical Bandpass Filters
The bandwidth of an optical bandpass filter is a critical parameter that defines the range of wavelengths that the filter allows to pass through while blocking others. It is typically characterized by the Full Width at Half Maximum (FWHM), which describes the spectral bandwidth over which the filter transmits light. Specifically, FWHM is determined by the wavelengths at which the transmission drops to 50% of its maximum value.
Bandpass Filter Categorized by Bandwidth
- Narrowband Filters: These filters have bandwidths of less than 10 nm, often used in applications such as laser clean-up and chemical detection.
- Broadband Filters: These can have bandwidths ranging from 50 nm to 80 nm, suitable for applications like fluorescence microscope
*If the bandwidth is from 10-40nm, it will be usually categorized as standard bandpass filter.
