Abstract
We have developed a potentially portable tabletop combined remote LIBS-Raman spectroscopy system using a high-resolution gated echelle spectrograph for measuring both atomic and molecular emission spectra at a standoff distance of 6.5 m. The system consists of a frequency-doubled Nd: YAG laser, a 4X beam expander, a Cassegrain telescope, and a gated echelle spectrograph. The unique advantages of simultaneous broadband coverage (250–850 nm) and high resolution of the echelle system have been employed for measuring the non-identical emission spectrums (LIBS and Raman) at remote distances. The viability and practicability of the low throughput gated echelle spectrograph for detecting the remote Raman signals were evaluated critically by recoding a series of organic chemicals and solid samples. Further, the feasibility of measuring Raman signals of organic chemicals through different colored bottles was also demonstrated. Additionally, the combined LIBS-Raman spectra of several medium Raman cross-section solids samples were recorded from a standoff distance of 6.5 m, and the results are presented here. The benefits of merging the LIBS and Raman spectroscopy system and the bidirectional use of these techniques for remote measurements have also been highlighted.
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