Abstract
Until now, spatially resolved Raman Spectroscopy has required to scan a sample under investigation in a time-consuming step-by-step procedure. Here, we present a technique that allows the capture of an entire Raman image with only one single exposure. The Raman scattering arising from the sample was collected with a fiber-coupled high-performance astronomy spectrograph. The probe head consisting of an array of 20 × 20 multimode fibers was linked to the camera port of a microscope. To demonstrate the high potential of this new concept, Raman images of reference samples were recorded. Entire chemical maps were received without the need for a scanning procedure.
Highlights
Laser Raman spectroscopy [1] is a powerful technique to determine chemical compositions.In combination with a microscope, high contrast chemical maps of the sample under investigation can be constructed
The peaks at 292 cm−1 and 385 cm−1, 734 cm−1, 1218 cm−1, 1302 cm−1 and 1382 cm−1 (C-C stretching), match the values specified in the literature [20]
To the best of our knowledge, the first validation of astronomical Integral-Field Spectroscopy (IFS) as a tool for creating Raman maps simultaneously from a single exposure
Summary
Laser Raman spectroscopy [1] is a powerful technique to determine chemical compositions. MUSE e.g., delivers a total of 90,000 individual spectra, resulting in spectral images of 300 × 300 spatial elements (“spaxels”) This instrument covers a free spectral range over one octave from 465 nm to 930 nm with a spectral resolution of ~0.25 nm and unprecedented sensitivity. In order to master the extremely high multiplex gain and, the complexity of the instrument, a modular design was adopted It incorporates, amongst various other subsystems, a total of 24 highly efficient identical spectrographs. As an attempt of technology transfer, we have adapted the concept of IFS to laboratory Raman spectroscopy by making an ad hoc combination of a fiber array with a copy of the high-end MUSE unit spectrograph, to record entire images without scanning [14]. We present the first results that demonstrate the feasibility of this concept
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