Laser initiation of PETN-based composites with inclusions of ultrafine aluminium particles

This paper describes the study on the dependence of the critical energy density of the explosive decomposition of PETN on the mass concentration of the inclusions of ultrafine Al particles (100–120 nm) in the range of 0.025–1% under the influence of the first and second harmonics of neodymium laser (12 ns, 1064 and 532 nm). It is shown that the critical energy of the explosion initiation by the first and second harmonics of laser radiation reaches a minimum value at the same absorption rates, but different concentrations of inclusions. The photoacoustic method is used to show that, as the laser energy radiation is absorbed, the pressure amplitude in the heated layer reaches a maximum value when the concentration of inclusions corresponds to the minimum value of the critical energy density.