Abstract
In the present work, we performed a combination of non-sequential ray tracing and numerical interferometric simulations to study the effect of the most important optical and experimental parameters on the performance of spatial heterodyne interferometric spectrometers, relevant to their use in laser-induced breakdown spectroscopy (spatial heterodyne laser-induced breakdown spectroscopy, SH-LIBS). We provide a detailed, numerical assessment of the spectral bandpass, tuning characteristics, spectral resolution, sensitivity and temporal gating achievable in such an instrument. These modeling results can pave the way for the construction of improved SH-LIBS spectrometers for elemental sensing.
Highlights
Most spectrometers today are still of the dispersive type, interferometric ones are rapidly gaining popularity, in infrared absorption spectroscopy or nuclear magnetic resonance spectroscopy, and in the UV and visible range
These conditions apply to laser-induced breakdown spectroscopy (LIBS)
It can be stated that the dispersion of pulsed light in the Spatial heterodyne spectroscopy (SHS) arrangement alone is very small compared to the dispersion that occurs in the optical fiber, if the LIB plasma emission is coupled into the SHS arrangement via a fiber
Summary
Most spectrometers today are still of the dispersive type, interferometric ones are rapidly gaining popularity, in infrared absorption spectroscopy or nuclear magnetic resonance spectroscopy, and in the UV and visible range. The same group reported about another successful application of stand-off spatial heterodyne LIBS spectroscopy (and Raman spectroscopy) This time the miniature SHS arrangement was built inside a 100 × 100 × 100 mm 1 U NASA CubeSat architecture and the spectra of several minerals were recorded with good S/N from a distance of 10 m, using a 100 mm diameter entrance optics composed of either a Fresnel lens or a long-distance microscope [31]. We use a combination of non-sequential ray tracing and numerical interferometric simulations to assess the spectral band pass, tuning range, spectral resolution, sensitivity and time dispersion achievable in such an instrument These modeling results can pave the way for the construction of improved SH-LIBS spectrometers for elemental sensing
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