Kobylinskiy, A.A.KobylinskiyLaue, B.B.LaueFörster, E.E.FörsterHöfer, B.B.HöferShen, Y.Y.ShenHillmer, H.H.HillmerBrunner, R.R.Brunner2022-03-062022-03-062020https://publica.fraunhofer.de/handle/publica/26221810.1364/AO.382714A method that significantly increases the detection efficiency of filter array-based spectral sensors is proposed. The basic concept involves a wavelength-dependent redistribution of incident light before it reaches the filter elements located in front of the detector. Due to this redistribution, each filter element of the array receives a spatially concentrated amount of a pre-selected and adjusted spectral partition of the entire incident light. This approach can be employed to significantly reduce the reflection and absorption losses of each filter element. The proof-of-concept is demonstrated by a setup that combines a series of consecutively arranged dichroic filters with Fabry-Perot filter arrays. Experimentally, an efficiency increase by a factor larger than 4 compared to a reference system is demonstrated. The optical system is a non-imaging spectrometer, which combines the efficiency enhancement module with the filter arrays, is compact (17.5 mm × 17.5 mm × 7.8 mm), and integrated completely inside the CCD camera mount.enCCD camerasoptical systemwave filtersabsorption lossdetection efficiency620535journal article