Mechanism of hot spots formation in pentaerythritol tetranitrate under pulsed laser irradiation

7th International Conference for Young Scientists "High Technology: Research and Applications"

工业技术（总论）

Oleshko, V.I.^1 ; Tsipilyov, V.P.^1 ; Zarko, V.E.^2 ; Yakovlev, A.N.^1 ; Mazur, M.A.^1

National Research Tomsk Polytechnic University, Tomsk

634050, Russia^1

Voevodsky Institute of Chemical Kinetics and Combustion, SB RAS, Novosibirsk, Russia^2

关键词: Amplitude characteristics;    Energy density;    First harmonic;    Inhomogeneities;    Low thresholds;    Multipulses;    Optical breakdown;    Pentaerythritol tetranitrate;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/510/1/012020/pdf
DOI  :  10.1088/1757-899X/510/1/012020

学科分类：工业工程学

来源: IOP

【 摘 要 】

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/cm2. 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.