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Title: Mechanism of hot spots formation in pentaerythritol tetranitrate under pulsed laser irradiation
Authors: Oleshko, Vladimir Ivanovich
Tsipilev, Vladimir Papilovich
Zarko, V. E.
Yakovlev, Aleksey Nikolaevich
Mazur, Marina Aleksandrovna
Keywords: образование; горячие точки; лазерное облучение; прессованные образцы; отжиг; тетранитрат пентаэритрита; дефекты
Issue Date: 2019
Publisher: IOP Publishing
Citation: Mechanism of hot spots formation in pentaerythritol tetranitrate under pulsed laser irradiation / V. I. Oleshko [et al.] // IOP Conference Series: Materials Science and Engineering. — Bristol : IOP Publishing, 2019. — Vol. 510 : High Technology: Research and Applications (HTRA-2018) : The VII International Conference for Young Scientists, 26–30 November 2018, Tomsk, Russian Federation : [proceedings]. — [012020, 5 p.].
Abstract: 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.
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