Fig. 1. Structure of holographic waveguide condensing system

Fig. 2. System calculation process

Fig. 3. Non sequential tracking process

Fig. 4. Diffraction efficiency changes with angular shift

Fig. 5. Construction of experimental platform for spotlight system and detector

Fig. 6. Experimental platform after integrating the spotlight system

Fig. 7. Absorption coefficient of Sb₂S₃

Fig. 8. Structural diagram of Sb₂S₃ thin film detector

Fig. 9. Performance diagram of Sb₂S₃ thin film detector light responsiveness and curve of specific detectivity changing with wavelength

Fig. 10. Detector response speed chart of Sb₂S₃ thin film photodetector

Fig. 11. The curve of frequency response

Fig. 12. Detector photogenerated current diagram

Fig. 13. Overall model diagram of underwater VLC system