Dual-Wavelength Raman Fusion Spectroscopy

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Materials Science

Background:

• Traditional Raman spectroscopy often requires sequential laser acquisitions, limiting real-time process monitoring.
• Limited detection spectral range in conventional systems necessitates spectrum concatenation, introducing potential inaccuracies.
• Investigated objects can change between sequential spectral acquisitions, hindering quantitative analysis.

Purpose of the Study:

• To introduce spectral fusion as a method for dual-wavelength Raman spectroscopy.
• To enable simultaneous acquisition of Raman spectra from two different wavelengths.
• To facilitate quantitative analysis in process monitoring applications using Raman spectroscopy.

Main Methods:

• Simultaneous illumination of the sample with two excitation lasers.
• On-chip fusion of Raman spectra acquired at different wavelengths.
• Application of univariate and multivariate methods for quantitative evaluation of fused spectra.

Main Results:

• Demonstrated the feasibility of spectral fusion for dual-wavelength Raman spectroscopy.
• Showcased that the fused spectral data are suitable for quantitative analysis.
• Validated the use of both univariate and multivariate methods on the fused data.

Conclusions:

• Spectral fusion overcomes limitations of sequential acquisition in dual-wavelength Raman spectroscopy.
• The proposed method allows for quantitative analysis in real-time process monitoring.
• Dual-wavelength Raman fusion spectroscopy paves the way for compact analytical devices.