Research on the propagation characteristics of blue-green laser through sea surface with foams

Submarine laser communication is a kind of technology which uses blue-green laser to carry on the data transmission between the aircraft or ship and deep water. The laser transmission characteristics are greatly influenced by the air/sea interface, which becomes rougher and even covered with foams because of wind speed as well as other acting force. In this paper, by using the Kirchhoff approximation, the influences of polarization state and the incident wave on the transmission characteristics were studied, based on the Mie theory and the radiative transfer theory, the transmission characteristics of blue-green laser through rough sea surface with foams were analyzed in detail, the influences of the roughness of sea surface and wind speed on laser transmission and energy distribution were analyzed. The results show that the energy distribution of blue-green laser through sea surface is more concentrated compared to microwave, which mainly distributed in the refraction direction, the transmission characteristics have a great dependence on the roughness and wind speed. This provides a certain theoretical basis for related research.