Abstract

Effective methods are urgently required to optimize Raman spectroscopy technology to ameliorate its low detection sensitivity. Here, we superposed two near-concentric cavities to develop a dual near-concentric cavities group (DNCCG) to assess its effect on gas Raman signal intensity, signal-to-noise ratio (SNR), and limit of detection (LOD). The results showed that DNCCG generally had higher CO₂ Raman signal intensity than the sum of two near-concentric cavities. Meanwhile, the noise intensity of DNCCG was not enhanced by the superposition of near-concentric cavities. Accordingly, DNCCG increased the SNR. The LOD for CO₂ was 24.6 parts per million. DNCCG could be an effective method to improve the detection capability of trace gases and broaden the dynamic detection range, which might aid the future development of innovative technology for multicomponent gas detection.

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