Analysis of the Sizes and Number of Microparticles in the Ablation Plume, Which Attenuates Laser Radiation During Ablation of a Constructive Material

摘要

The effect of laser radiation with a wavelength of 1.3 μm, power of 25kW, pulse width of 1 s, and irradiated spot area of 9 cm~2 on carbon silicon carbide composite material (CSCCM) is analyzed. The formation of an ablation plume (which consists of vapor of irradiated material, burning products, drops and microparticles of various chemical composition and size) above the irradiated surface leads to a significant loss of laser energy. The fractions of the scattered and absorbed laser radiation in the plume are determined, the size and mass distributions of microparticles in the plume are estimated, their concentration is calculated, and the microparticle escape velocities from the irradiated CSCCM surface are evaluated.