Journal
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
Volume 29, Issue 4, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2022.3185735
Keywords
Raman scattering; Spectroscopy; Laser beams; Laser tuning; Lasers; Fluorescence; Pump lasers; Biological tissues; laser excitation; Raman spectroscopy
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This study explores the use of instrumentation to accelerate the acquisition of Raman spectra. It demonstrates the equivalence between Raman Excitation Spectroscopy and conventional Raman Spectroscopy through experimental measurements. It also shows the potential of interpolating low-resolution excitation spectra to obtain higher resolution excitation spectra using excess information in Raman Excitation Maps. The development of fast tunable lasers and highly sensitive single-pixel detectors further enhances the prospects for dedicated Raman Excitation Spectroscopy instruments.
As spontaneous Raman spectroscopy is demonstrated to be viable for many applications, it is still held back by its inherently low signal and typically extended acquisition time. While several techniques can overcome this by enhancing the scattered signal to quicken acquisition, a parallel field that quickens spectral acquisition using instrumentation has received less focus. In principle, Raman spectra could be obtained by tuning the excitation wavelength and measuring the Raman signal at a fixed wavelength using a single-pixel detector. Before exploring the potential of quicker acquisition, it is important to first study the equivalence of Raman Excitation Spectroscopy and conventional Raman Spectroscopy experimentally. We demonstrate the equivalence between the two techniques for biological and non-biological samples by measuring Raman Excitation Maps. Additionally, we explore the interpolation of low-resolution excitation spectra using excess information in the maps for higher resolution excitation spectra. This work, together with current progression in fast tunable lasers and highly sensitive single-pixel detectors, provides a promising prospect for dedicated Raman Excitation Spectroscopy instruments to be developed.
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