The spectral, kinetic, spatial, and amplitude characteristics of emissions of pressed samples of PETN (pentaerythritole tetranitrate) by the first harmonic of a neodymium laser (1064 nm, 12 ns) are studied. It is found that at the moment of irradiation of PETN by laser pulses, hot spots are formed on the surface of the samples. The energy density of laser radiation varies in the range of 0.5-3 J/cm 2 . The characteristics of hot spots are determined by absorbing inhomogeneities and parameters of laser radiation. Multi-pulse excitation leads to the annealing of absorbing irregularities and increased threshold of optical breakdown. The received results are interpreted on the basis of ideas of the low-threshold optical breakdown as evolving within local (defective) regions of the PETN in the electric field of the light wave.
|Journal||IOP Conference Series: Materials Science and Engineering|
|Publication status||Published - 24 Apr 2019|
|Event||7th International Conference for Young Scientists on High Technology: Research and Applications 2018, HTRA 2018 - Tomsk, Russian Federation|
Duration: 26 Nov 2018 → 30 Nov 2018
ASJC Scopus subject areas
- Materials Science(all)