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| Mechanisms and Optimization for Parameters of Laser Power and
Exposure Time in Differential Raman Spectroscopy |
| ZHAO Ying1*, LI Zi-zhuo1, CHEN Ji-wen1*, HUANG Zhi-xing2, GAO Chun-hao1 |
1. North China University of Technology, Beijing 100144，China
2. Guoning New Storage (Fujian) Technology Co., Ltd., Fuzhou 352000，China
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Abstract Fluorescence-suppressed frequency-shifted differential Raman spectroscopy utilizes the original Raman spectra collected from two lasers with similar wavelengths, combined with a differential reconstruction algorithm, to effectively suppress fluorescence interference. This technique demonstrates significant advantages in analyzing samples with complex backgrounds. The quality of the reconstructed differential Raman spectra directly depends on the original Raman spectra, making it essential to systematically investigate the influence of key parameters such as laser power and exposure time. This study system atically explores the effects of these parameters on the reconstructed differential Raman spectra of various samples. Results indicate that while increasing laser power or prolonging exposure time enhances the intensity of characteristic Raman peaks and improves the signal-to-noise ratio and measurement precision, exceeding specific thresholds can induce nonlinear responses. For instance, under certain high-power and long-exposure conditions, polystyrene exhibited nonlinear growth in characteristic peak intensity and altered relative peak intensities. However, this phenomenon was eliminated when the exposure time was reduced, confirming that the spectral distortion originated from thermal effects rather than self-absorption. Furthermore, the study clarified the synergistic role of laser power and exposure time in inducing thermal effects. Based on these findings, targeted parameter optimization strategies were proposed: for qualitative analysis, higher laser power and optimized exposure time should be adopted to ensure high full-spectrum similarity; for quantitative analysis, shorter exposure times should be prioritized to suppress thermal effects, and laser power should be optimized under the premise of maintaining stable relative peak intensities to achieve optimal precision. This research provides important experimental evidence and parameter optimization guidance for the reliable application of differential Raman spectroscopy in qualitative and quantitative analysis.
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Received: 2025-11-11
Accepted: 2026-01-16
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Corresponding Authors:
ZHAO Ying, CHEN Ji-wen
E-mail: zhaoying@ncut.edu.cn；chenjiwen@ncut.edu.cn
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