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Proceedings Paper

Spectrometer design approaching the limit
Author(s): Rainer Riesenberg; Andreas Wuttig; Thomas Peschel; Christoph Damm; Hans-Jürgen Dobschal
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Paper Abstract

The design limits of grating array spectral sensors are discussed. The limit of a grating spectrometer with respect to the resolution is given by the diffraction limit of the grating. To approach the limit for the visible spectral region the entrance slits should reach a width of 2 μm and larger depending on wavelength and numerical aperture. The detector pixel sizes should be in the same range, which is achieved virtually by the discussed double array arrangement with a transmissive, static slit array and detector array. A number of techniques are applied for optimizing the performance as well as for miniaturization. A sub-pixel imaging including a sub-pixel analysis based on the double array arrangement virtually reduces the detector pixel sizes down to about 20%. To avoid the imaging aberrations the spectra is imaged from different entrance positions by the entrance slit array. The throughput can be increased by using a two dimensional entrance slit array, which includes a multiplex pattern or a fixed adaptive pattern. The design example of a UV-Raman spectral sensor is presented including spectral measurements.

Paper Details

Date Published: 27 September 2008
PDF: 8 pages
Proc. SPIE 7100, Optical Design and Engineering III, 71001A (27 September 2008); doi: 10.1117/12.797706
Show Author Affiliations
Rainer Riesenberg, Institute for Photonic Technology, Jena (Germany)
Andreas Wuttig, Institute for Photonic Technology, Jena (Germany)
Thomas Peschel, Institute for Applied Optics and Precision Engineering (Germany)
Christoph Damm, Institute for Applied Optics and Precision Engineering (Germany)
Hans-Jürgen Dobschal, Carl Zeiss AG (Germany)

Published in SPIE Proceedings Vol. 7100:
Optical Design and Engineering III
Laurent Mazuray; Jean-Luc Tissot; Jeffrey M. Raynor; Rolf Wartmann; Andrew Wood, Editor(s)

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