Global-space propagating characteristics of pulsed-laser-induced shock waves

摘要

Under the propagating limitation-conditions and based on the pulsed-laser-induced plasma shock wave theory,(1) the propagating rules in the global free space (including close areas and mid-far areas) of pulsed-laser-induced shock waves are established for the first time. Compared with the previous work by Bian et al.,(2) our theoretical model can directly lead to the relationship of the initial Mach number M-0 of plasma shock waves and the whole energy E released into plasma shock waves from a pulsed laser without any approximations or any unnecessary experimental parameters. Here, M-0 is also related to the pulse duration tau(0) and the sound velocity upsilon(0) in the atmosphere; the variation of attenuation index tau, as a function of laser parameters (especial tau(0)), is also obtained, and our theoretical predictions of mid-far propagating rules of plasma shock waves are in good agreement with experimental results. In addition, it should be noted that Sedov-Taylor solutions to the ideal shock wave in a point explosion are only the approximations of the propagating rules in the mid-far area of pulsed-laser plasma shock waves that we obtained. [References: 16]