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Concept and optical design of a compact cross-grating spectrometer

: Bagusat, V.; Kraus, M.; Förster, E.; Thomae, D.; Hönle, T.; Brüning, R.; Hillmer, H.; Brunner, R.

Volltext ()

Journal of the Optical Society of America. A, Optics, image science, and vision 36 (2019), Nr.3, S.345-352
ISSN: 1084-7529
ISSN: 0740-3232
ISSN: 1520-8532
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()

The concept of a new compact echelle-inspired cross-grating spectrometer is introduced, and a specific optical design is presented. The new concept aims to achieve simultaneously a high spectral resolution, a wide accessible spectral range, and compact dimensions. The essential system novelty concerns the combination of different aspects: the implementation of a crossed grating comprising both the main dispersion and order separation, a folded reflective beam path, which enables a reduction of the system volume, and the introduction of a form-adjustable mirror for aberration compensation. The exemplary optical design offers a spectral bandwidth ranging from 330–1100 nm with spectral resolution better than 1.4 nm in the fourth and 0.4 nm in the 11th order. The optical setup covers a volume of 110 mm × 110 mm × 30 mm.