Development of a dynamic Fourier-transform Raman spectrometer
Dmitriy R. Anfimov1, Iliya S. Golyak, Igor L. Fufurin1, Ivan B. Vintaykin1, Andrey N. Morozov1
1Bauman Moscow State Technical University, Moscow
Abstract
The development of a dynamic Fourier-transform Raman spectrometer is aimed at creating a device The development of a dynamic Fourier-transform Raman spectrometer is aimed at creating a device that combines the high information yield of Raman spectroscopy with the advantages of interference signal detection. The device is based on an interferometer with a movable corner reflector, which generates an interferogram of scattered radiation, which is converted into a spectrum using an inverse Fourier transform. A reference channel for mirror calibration ensures the accuracy and reproducibility of the wavenumber scale. A 976 nm laser excitation source suppresses fluorescence background by reducing the probability of populating high electron levels of the sample—the main limitation of dispersive Raman spectroscopy when analyzing colored, biological, and polymeric materials.
A separate advantage of the dynamic Fourier-transform scheme is the ability to effectively operate at a significant distance from the sample using high-power lasers. The absence of an entrance slit and the associated strict focusing requirements allows for a wider aperture of the receiving optics, simplifying the collection of scattered radiation over long distances. The developed device successfully identified small quantities of liquid and solid substances (several tens of grams per square meter) at a distance of 1 m using a laser power of up to 27 W.
The developed device achieves a spectral resolution of 4 cm⁻¹ over a wide detection range of 1000 - 1650 nm within a single optical design, allowing for the separation of closely spaced spectral lines. This combination of characteristics defines the device's potential for application in chemical and pharmaceutical analysis, materials science, quality control, and biomedical research, where tissue fluorescence limits the capabilities of dispersive instruments.
Speaker
Anfimov Dmitriy
Bauman Moscow State Technical University
Russian Federation
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