Spectral regularities of the critical energy density of the pentaerythriol tetranitrate-aluminum nanosystems initiated by the laser pulse

In this work, the absorption of aluminum nanoparticles and the critical energy densities of the pentaerythritol tetranitrate-aluminum nanosystems, initiated by laser pulses, were calculated for wavelengths from 400 to 1200 nm. Data showed that it is necessary to consider both thermal and optical characteristics in order to calculate the critical initiation energy density and the radius of the most dangerous inclusion. The nanoparticle's radius, corresponding to the maximum on the curve of absorptivities, and the maximum's amplitude and critical energy density of the explosive materials, were all shown to depend on the initiating wavelength. The maximum of the aluminum nanoparticles' absorptivity and minimum of the critical energy density of the explosive decomposition were observed for the 400 nm wavelength, there is also a local maximum at 850 nm. The results from the experiment qualitatively and quantitatively agree with our calculations. These results are very important to optimize the cap composition for the optical detonators.