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Updated: Feb 5, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
Published on: December 22, 2015
An imaging spectrometer employing tunable hyperchromatic microlenses
Phuong-Ha Cu-Nguyen1, Adrian Grewe2, Patrik Feßer2
1Gisela and Erwin Sick Chair of Micro-optics, Department of Microsystems Engineering, University of Freiburg, Freiburg 79110, Germany.
Abstract:
We present the design, fabrication and characterization of hydraulically-tunable hyperchromatic lenses for two-dimensional (2D) spectrally-resolved spectral imaging. These hyperchromatic lenses, consisting of a positive diffractive lens and a tunable concave lens, are designed to have a large longitudinal chromatic dispersion and thus axially separate the images of different wavelengths from each other. 2D objects of different wavelengths can consequently be imaged using the tunability of the lens system. Two hyperchromatic lens concepts are demonstrated and their spectral characteristics as well as their functionality in spectral imaging applications are shown.
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