Numerical Simulation Of Thermal Blooming In Atmospheric High Energy Laser Propagation

With the development of laser technology, the high-energy laser plays an increasingly important role in military and civilian fields. When the high-energy laser is propagated in the atmosphere, a series of effects which limit the effective propagation severely are produced. Thus, the study of the propagation rules for laser beams through the atmosphere is of great significance for the effective application of the high-energy laser.The thesis introduces the characteristic of high-energy laser propagation in atmosphere. Based on the Maxwell's equations and hydrodynamic equations, the paraxial wave equation and density perturbation equation are deduced. And the laser power threshold of thermal blooming is computed. Then, the numerical algorithm of paraxial wave equation and the density of perturbation equation are discussed particularly. Based on thermal blooming equations solved by Discrete Fourier Transformation, four factors impacting the thermal blooming are also discussed, including laser power, effective absorption coefficient, the horizontal velocity and high-energy laser propagation distance.