Characterisation and Analysis of Underwater White Light Sources

As people explore the oceans more and more, there is a more urgent need for high-precision and effective underwater detection means, especially underwater imaging technology, which is developing rapidly. Underwater illumination is an important part of underwater imaging detection, and existing underwater illumination light sources include monochromatic light sources and white light sources, which are increasingly used due to their spectral coverage and imaging colour advantages. As an artificial light source, the white laser has the advantages of good monochromaticity, directionality, coherence and high brightness. To successfully apply the white laser light source to underwater lighting, problems in its power supply, structure, light source stability and spectral characteristics need to be solved. To understand the spectral characteristics of underwater white laser light sources and to compare them with existing LED underwater white light sources, the spectral characteristics of the two underwater white light sources were tested and analysed utilizing spectral characterisation experiments, with distance and water quality as variables. The results of the experimental data show that white laser light sources and LED white light sources have similar patterns in terms of spectral characteristics and spectral quality parameters, but white laser light sources have obvious advantages in terms of two parameters: illumination and main wavelength. The results of the paper provide a reference for the spectral characteristics of underwater white laser light sources and are of great significance in promoting the application of semiconductor-combined beam white lasers in underwater lighting and imaging applications.