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Optical filter

    The filter is composed of two stacked reflective medium layers separated by evenly spaced layers. These reflective dielectric film stacks consist of materials with alternating high and low refractive indices that exceed 99.99% reflectivity. By changing the thickness of the spacer layer and/or the number of reflectors, the central wavelength and bandwidth of the filter can be changed.

Categories:
The spectral bands are divided into: visible band filters (band pass filters with a central wavelength of 400-700 nm), infrared band filters (band pass filters and laser line filters with a central wavelength of 700-1650 nm), and ultraviolet band filters (band pass filters and laser line filters with a central wavelength of 340-420 nm).
Spectral characteristics filter: infrared bandpass filter, edge pass filter, notch filter, ultra-narrow band filter