Fig. 1. Structural diagram of Raman probe system

Fig. 2. Schematic of optical path. (a) Plane end face fiber probe; (b) beveled end face fiber probe; (c) lens coupled fiber probe[9]

Fig. 3. Hollow optical fiber probe system added with ball lens and results. (a) Schematic and physical map; (b) Raman spectrum of skin; (c) Raman spectrum of subcutaneous adipose tissue; (d) Raman spectrum of visceral adipose tissue[5]

Fig. 4. Optical fiber Raman probe system[17]

Fig. 5. Optical design of miniature confocal Raman probe[21]

Fig. 6. FLIM/Raman design. (a) Structural diagram of FLIM/Raman probe side; (b) cross-sectional diagram of FLIM/Raman probe side; (c) schematic of FLIM/Raman probe back-end connection module[26]

Fig. 7. Forward surface-enhanced Raman probe system[28]