Fig. 1. Calculation and experimental results of the relative output Raman scattering intensity

Fig. 2. Schematic of Z-shaped folded multi-pass cavity enhanced Raman spectroscopy detection platform

Fig. 3. Raman spectrum of gases in the gas cell before and after pumping

Fig. 4. Raman spectrum of H₂ and quantitative analysis model

Fig. 5. Raman spectrum of CO and quantitative analysis model

Fig. 6. Raman spectrum of CO₂ and quantitative analysis model