A combined Raman and laser-induced breakdown (LIBS), spatial-heterodyne spectrometer (SHLS/SHRS) is described for remote measurements using Fresnel collection optics. The spatial heterodyne Raman and LIBS spectrometers are based on a fixed diffraction grating interferometer with no moving parts that offers a very large field of view, high light throughput, and high spectral resolution in a small package. The field of view of the SHS spectrometer is ~1° making it very forgiving of collection optics alignment and image quality for remote Raman and LIBS measurements. In this paper we compare two different types of collection optics for remote spectral measurements, an inexpensive ~100-mm diameter, f/1.25 Fresnel lens and a high quality ~100-mm aperture Questar long distance microscope. Raman and LIBS measurements were made at 10 m for a variety of organic and mineral samples including materials from deep ocean hydrothermal vents. We found the performance of the Fresnel collection optics to be within a factor of three of the long distance microscope.

Remote Raman spectroscopy and LIBS using spatial heterodyne spectrometer with Fresnel collection optics

256th National Meeting (2018)

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