Fu WAN, Hu GE, Qiang LIU, Wei-ping KONG, Jian-xin WANG, Wei-gen CHEN. Research Progress and Trend of Gas Raman Sensing Enhancement Technology[J]. Spectroscopy and Spectral Analysis, 2022, 42(11): 3345
- Spectroscopy and Spectral Analysis
- Vol. 42, Issue 11, 3345 (2022)
Fig. 1. Schematic diagram of the multi-pass cavity
![Multi-pass cavity Raman detection system[26]](/richHtml/gpxygpfx/2022/42/11/3345/img_2.png)
Fig. 2. Multi-pass cavity Raman detection system[26]
Fig. 3. The basic setup of a PDH system
Fig. 4. PDH error signal
Fig. 5. Raman spectrum showing H2 Q(1) branch[35]
Fig. 6. Schematic diagram of optical feedback frequency locking process based on external resonant cavity
Fig. 7. The relationship between the laser coupled frequency and the free-running frequency, where ω 0 is the center frequency of the cavity mode
Fig. 8. F-P cavity enhanced Raman detection system based on optical feedback[40]
Fig. 9. Schematic diagram of Raman laser cavity for gas Raman enhancement
Fig. 10. Basic principle of fiber-enhanced gas Raman spectroscopy
Fig. 11. Silver-plated capillary Raman detection system[46]
Fig. 12. Hollow fiber Raman detection system[53]
Fig. 13. Schematic diagram of the combination of optical fiber and F-P cavity for gas Raman signal enhancement
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Table 1. Summary of limit of detection
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