Spectrometer design approaching the limit

Rainer Riesenberg; Andreas Wuttig; Thomas Peschel; Christoph Damm; Hans-Jürgen Dobschal

doi:10.1117/12.797706

27 September 2008 Spectrometer design approaching the limit

Rainer Riesenberg, Andreas Wuttig, Thomas Peschel, Christoph Damm, Hans-Jürgen Dobschal

Proceedings Volume 7100, Optical Design and Engineering III; 71001A (2008) https://doi.org/10.1117/12.797706
Event: Optical Systems Design, 2008, Glasgow, Scotland, United Kingdom

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.

Citation Download Citation

Rainer Riesenberg, Andreas Wuttig, Thomas Peschel, Christoph Damm, and Hans-Jürgen Dobschal "Spectrometer design approaching the limit", Proc. SPIE 7100, Optical Design and Engineering III, 71001A (27 September 2008); https://doi.org/10.1117/12.797706

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KEYWORDS

Sensors

Diffraction gratings

Spectroscopy

Detector arrays

Diffraction

Spectral resolution

Charge-coupled devices

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