Low-Threshold Optical Breakdown Of Compacted Samples From Energetic And Inert Materials; Energy Fluxes and Radiation Effects (EFRE-2020 online)
| Источник: | Energy Fluxes and Radiation Effects (EFRE-2020 online).— 2020.— [P. 911-916] |
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| Корпоративные авторы: | , |
| Другие авторы: | , , , |
| Примечания: | Title screen The paper studies the threshold, spectral, and kinetic characteristics of the luminescence of compacted samples from inert and energetic materials induced by their irradiation with the first harmonic of a neodymium laser (1064 nm, [tau]=16 ns). The results establish that irradiation of pure (without specially introduced impurities) samples with laser radiation with an energy density of (0.5-3) J/cm2 forms so-calledhot spots on their surface, the characteristics of which are determined by absorbing inhomogeneities (already present or introduced during sample preparation) and parameters of laser radiation. The atomic lines of alkali metals-Na and K-are predominant in the emission spectra. Multi-pulse excitation leads to annealing of absorbing inhomogeneities and increased optical breakdown threshold. In the samples with specially introduced aluminum impurities (composites), the luminescence and destruction thresholds are an order of magnitude smaller; the spatial distribution over the irradiated surface is close to homogeneous, and there are Al atomic lines in the luminescence spectra. The results obtained are interpreted via the concept of low-threshold optical breakdown, which develops on absorbing optical inhomogeneities and leads to the formation of near-surface laser plasma. Режим доступа: по договору с организацией-держателем ресурса |
| Язык: | английский |
| Опубликовано: |
2020
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| Предметы: | |
| Online-ссылка: | https://doi.org/10.1109/EFRE47760.2020.9242003 |
| Формат: | Электронный ресурс Статья |
| Запись в KOHA: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=663080 |