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Realization of a compact cross-grating spectrometer and validating experimental tests

: Kraus, M.; Förster, E.; Bagusat, V.; Hönle, T.; Uwurukundo, X.; Bohnert, P.; Brüning, R.; Hillmer, H.; Brunner, R.

Volltext ()

Applied optics 59 (2020), Nr.5, S.1338-1346
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()
plants (botany); spectral resolution; aberration compensation; compact dimensions; curved gratings

Echelle inspired cross-grating spectrometers offer the potential to bridge the gap between classical high-end echelle spectrometers and curved-grating single-element instruments. In particular, the cross-grating approach offers the possibility to simultaneously achieve a high spectral resolution and a wide accessible spectral range in compact dimensions and without moving parts. We report on the complete realization and implementation details of an all-reflective cross-grating spectrometer based on a modified Czerny–Turner configuration including a folded beam path and a toric-convex mirror for aberration compensation. The applicability of the cross-grating spectrometer is demonstrated by test measurements including the recording of the spectra of different plant leaves. For the cross-grating spectrometer, with an accessible wavelength range between 330 and 1100 nm, a spectral resolution of 0.6 nm at 589 nm was achieved.