Fig. 1. The transmitted signal intensity under different feedback phases

Fig. 2. The relationship between CTS and feedback phase

Fig. 3. Feedback phase region division

Fig. 4. Feedback phase adjustment ideas

Fig. 5. V-shaped cavity optical feedback Raman spectroscopy gas detection platform

Fig. 6. The change of the maximum value of CTS in the traditional optical feedback phase locking method under the interference of fast airflow

Fig. 7. The change of the maximum value of CTS in the proposed method under the interference of ast airflow

Fig. 8. Cavity mode signal

Fig. 9. Detection results of N₂ and O₂ Raman spectra in air

Fig. 10. Raman spectrum detection results of CO₂ standard gas