Simulation and Experiment Study on Underwater Nonlinear Photoacoustic Effect

Nonlinear photoacoustic effect in water mainly includes two contributions, plasma expansion and bubble blasting. The Cavitation bubble collapses process and Plasma length of breakdown in dielectric breakdown mechanism are studied by simulation as well as the characteristic analysis of photoacoustic signals from experiment results. Unique advantages of nonlinear photoacoustic source and potential application of photoacoustic signals are depicted in detail, and according to the actual application prospect, the transmission characteristics of photoacoustic signals in water is simulated and analyzed.