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Improved correction by freeform surfaces in prism spectrometer concepts

: Tang, Z.; Gross, H.


Applied optics 60 (2021), Nr.2, S.333-341
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
ISSN: 2155-3165
Fraunhofer IOF ()

The correction of spatial resolution and distortion in imaging spectrometer systems is of great importance due to their significant impact on efficiency and quality. In this study, we analyze the corrective power of freeforms added at different positions in various spectrometer systems for high-performance requirements. The results show that the combination of a freeform prism and a second freeform close to the image has the best correction of distortion while preserving spot size.