A bandpass optical filter is designed to:

A bandpass optical filter is specifically designed to allow light to pass through only within a certain range of wavelengths while effectively blocking wavelengths outside this specified range. This characteristic is crucial for applications such as fluorescence microscopy and flow cytometry, where it is necessary to isolate specific colors emitted by different fluorescent markers or stains.

By permitting only light within designated wavelengths to pass, the filter enhances the signal from relevant fluorescent signals while reducing background noise and interference from other wavelengths. This selectivity helps in improving the accuracy and clarity of the data collected during cytometric analysis.