Fig. 1. Overall frame of fiber Raman probe

Fig. 2. Diagram of dual fiber optic Raman probe^[8]

Fig. 3. Structural diagram of the fiber Raman probe with puncture needle^[10]

Fig. 4. Schematic of metal substrate hollow-core fiber expansion kit^[14]

Fig. 5. Conventional optical path diagram of front end of fiber Raman probe

Fig. 6. Structural diagram of the front end objective based on ultrafast laser-assisted etching technology^[23]

Fig. 7. Schematic diagram of the front end of the Raman probe based on the liquid lens autofocusing unit^[25]

Fig. 8. Structural parameter diagram of fully metasurface-based fiber ^[26]

Fig. 9. Small Raman endoscope system^[31]

Fig. 10. Raman imaging results based on augmented reality technology ^[42]