Study on the effect of chlorophyll content in seawater on light transmission characteristics

The chlorophyll content in seawater seriously affects the inherent optical properties of seawater and the light transmission characteristics. This paper investigates the relationship between inherent optical properties and chlorophyll concentration in seawater applicable to class 1 seawater and part of class 2 seawater. The transmission of 405 nm violet and 532 nm green laser beams in seawater with a chlorophyll concentration range of 0-12 mg/m³ was simulated using the Monte Carlo method. The light field distribution, the on-axis laser energy, and the variation of the laser spot size with the transmission distance were obtained. The simulation results show that the transmission characteristics of 405 nm light are better for near-shore seawater with high chlorophyll concentration, while the transmission distance is longer for 532 nm light in the clearer deep-sea region. The study of the effect of chlorophyll content in seawater on light transmission characteristics can provide theoretical guidance for marine laser communication, lidar and laser underwater imaging, and other marine equipment.