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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

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Published on: December 22, 2015

Spectral uniformity of two- and four-level diffractive optical elements for spectroscopy.

Hallvard Angelskår¹, Ib-Rune Johansen, Matthieu Lacolle

¹Department of Physics, University of Oslo, Center for Materials Science and Nanotechnology, Blindern, Norway. hallvard.angelskar@fys.uio.no

|June 10, 2009

Summary

This study compares two-level and four-level diffractive optical elements (DOEs) for near-infrared spectroscopy. The four-level DOE design demonstrates superior spectral uniformity, meeting industrial application requirements.

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Area of Science:

Optics
Spectroscopy
Materials Science

Background:

Diffractive optical elements (DOEs) are crucial for manipulating light in various applications.
Industrial near-infrared (NIR) spectroscopy demands high spectral uniformity from optical components.
Silicon-based DOEs coated with gold offer potential for NIR applications.

Purpose of the Study:

To simulate and characterize gold-coated silicon DOEs for NIR spectroscopy.
To evaluate the spectral uniformity of two-level and four-level binary DOE designs.
To determine the suitability of DOE designs for industrial NIR spectroscopic applications.

Main Methods:

Design and fabrication of two-level and four-level binary DOEs in silicon.
Coating DOEs with gold for enhanced reflectivity in the NIR spectrum.
Simulations to predict and analyze DOE spectral response.
Experimental measurements of spectral response uniformity across the DOE surface.

Main Results:

Four-level DOE designs exhibit significantly better spectral response uniformity compared to two-level designs.
Measurements and simulations confirm the superior performance of the four-level design.
The four-level DOE design meets the stringent spectral uniformity requirements for industrial NIR spectroscopy.

Conclusions:

Four-level diffractive optical elements are suitable for industrial NIR spectroscopy due to their spectral uniformity.
Two-level diffractive optical elements are generally unsuitable for applications requiring high spectral uniformity.
The study validates the performance of advanced DOE designs for specialized spectroscopic applications.