Optical Engineering
Angle-Tuned Thin-Film Interference Filters for Spectral Imaging
By using angle-tuned thin-film interference filters, optical engineers can capture nonstandard wavelengths during spectral imaging without compromising performance.
Angle tuning an optical filter is an established trick that is used to select wavelength regions that are not covered by standard filters. It is especially helpful for optical engineers who wish to use a standard bandpass filter in order to avoid custom manufacturing. However, trying to capture as many precious photons as possible often results in a significant loss of filter performance, especially at larger tuning angles.
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