Research of laser-induced underwater communication zoom optical system

Based on the loss of laser-induced acoustic signal caused by the undulation of sea level, which affects the communication quality of laser-induced underwater communication system, a laser-induced underwater communication zoom optical system with a focusing position of 10km and a focusing position variation range of +/-500m is designed. The theoretical relationship between the adjustment distance and the focusing position is established and the far-field distribution of the Gaussian beam focusing system is simulated. The results show that the energy density of the far-field spot is concentrated, and the spot energy is the highest at the focusing position. The sea level condition was simulated, and the indoor pool experiment was carried out to verify the communication performance of the laser-induced acoustic communication system. The experimental results show that the waveform of the laser-induced acoustic signal and the rising edge of the electrical signal are completely consistent, there is no loss of the laser-induced acoustic signal, and the underwater communication quality is good. It provides a viable reference for laser-induced underwater communication systems with adaptive zoom.