Journal of Luminescence Volume 182, February 2017, Pages 45-48
Nikolay Vasilyev, B.V. Novikov, I.Kh. Akopyan, M.E. Labzovskaya
ZnO-based random lasing on nanoparticles realized by laser induced breakdown
Journal of Luminescence Volume 182, February 2017, Pages 45-48
DOI: 10.1016/j.jlumin.2016.10.012
A simple laser-assisted method to transform metallic Zn to a ZnO-based random lasing medium is reported. The method uses Nd+3 laser-induced air breakdown to treat the surface of a Zn target and thus produce ZnO nanoparticles randomly scattered over the broken area. Photoluminescence spectra of some places of the area at room temperature under resonant powerful photoexcitation exhibit the emission band at 395 nm with regularly spacing narrow spikes (<1nm) which is typical of multi-mode lasing. The band is suggested to be originated from electron-hole plasma arising at high excitation in ZnO-based structures. The micro lasers revealed are possibly composed of ZnO nanoparticles scattered in chains inside self-made random resonators, with Zn flinders being mirrors.
Семинар «Новейшие технологии в геномике»!
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Дата проведения: 28 февраля 2017 г. (вторник)
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Время проведения: 10:30 – 17:00
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10.02.2017 С 13 по 22 Февраля, будет проходить серия вебинаров Clarivate Analytics (Thomson Reuters)
С 13 по 22 Февраля, будет проходить серия вебинаров Clarivate Analytics (Thomson Reuters).
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Optical and Quantum Electronics Volume 49, No. 2, February 2017, Article 56, Pages 1-7
E. I. Ageev, Y. M. Andreeva, P. N. Brunkov, Y. Y. Karlagina, G. V. Odintsova, D. V. Pankin, S. I. Pavlov, V. V. Romanov, R. M. Yatsuk
Influence of light incident angle on reflectance spectra of metals processed by color laser marking technology
Optical and Quantum Electronics Volume 49, No. 2, February 2017, Article 56, Pages 1-7
DOI: 10.1007/s11082-016-0876-4
A comparison of oxide films formed on the stainless steel surface during laser and furnace heating is presented. Obtained samples were examined by optical and scanning electron microscopy. In order to characterize the optical properties, reflection spectra within the wavelength range 190–900 nm were measured with a spectrophotometer equipped with the integrating sphere for incidence angles from 0˚ to 60˚. The topology of obtained oxide films was characterized by scanning probe microscopy. Due to light interference in produced films, the coloration of treated area is observed. It was found that there is no change in the characteristic appearance of reflectance spectra at different light incidence angles, but a blue-shift occurs especially for the case of laser-induced films, which results in a visible change of surface color. This effect is associated with an interference character of originating color and features of surface relief under an oxide film.
